Rain intensity gauge accuracy rankings explained based on datasheets: tipping buckets, siphons, and weighing gauges

Required-depth analysis for rain-gauge short-window intensity

A transparent analytical-floor comparison of 86 ranked rain-gauge intensity rows plus 11 not-ranked reference rows from Barani, OTT HydroMet, Lambrecht, KISTERS / HyQuest, Geolux, Vaisala, Texas/Campbell, EML/In-Situ/Campbell ARG314, Précis Mécanique, Observator/RIMCO, METER, Casella, Davis, Onset HOBO, Met One, RainWise, MicroStep / Meteoservis, AEM/FTS, CAE, Pronamic, Seven Sensor Solutions, Rika, Honde, Renke, and Tamaya/Ikeda — including the Lambrecht rain[e] hi-resolution state-model rows. Each row is ranked by the minimum rainfall depth needed to reach a stated relative uncertainty target on a short reporting window during active rain. The full input parameters, formulas, and worked sample calculations are in the appendix so any reader can verify the numbers independently. The companion accumulation-total ranking covers daily and event totals. For background before reading the table, see the rain-gauge selection guide, the guide to rain-gauge types, common collector sizes and diameters, and the practical guide to rain-intensity error.

Conflict-of-interest disclosure (read first). This analysis is prepared by Jan Barani, founder and CEO of Barani Design Technologies, manufacturer of the MeteoRain product family that appears in the comparison set. To mitigate bias: (i) every input value is drawn from publicly available manufacturer datasheets and operating manuals — no proprietary or vendor-supplied data — so any reader can re-evaluate the framework against the same inputs; (ii) conservative modelling parameters are applied uniformly across all products (U95 = 2σ_total, γ_s = 1 for siphon TBRs, B3/B3 only for IoT³ phase-aware rows when the reporting window is interior to active rain — short-window intensity is exactly that case); (iii) no vendor of any compared product has funded, reviewed, or approved this analysis. The full formulas and per-category sample calculations are in the appendix below; readers who suspect bias are encouraged to substitute alternative parameter values and verify the results.

New to the terms used in this comparison? The words “tipping bucket,” “siphon,” and “weighing gauge” refer to different rain-gauge measuring principles, while collector area comes from standard rain-gauge sizes and diameters. Because this article ranks short-window intensity, the key background is the practical guide to rainfall-rate and rain-intensity error and the rain-rate intensity classification. Field results still depend on exposure, so the analytical floor should be read together with siting and mounting guidance.

What this ranking is and is not

What it shows

An intrinsic analytical floor from the instrument architecture and transmitted output state for short-window intensity readings during active rain (1-min, 10-min, rolling 30-min, and longer windows interior to an event). Useful for short-listing products that can reach a stated accuracy target under best-case conditions when the reporting window sits inside a rain event. Standards context is discussed in rain-gauge accuracy and WMO/NWS standards.

What it does not show

Field accuracy. Wind under-catch, evaporative loss, debris, shielding, calibration drift, siting effects, spatial representativeness, response time, filter bandwidth, output delay, durability, cost, power, and maintenance burden are not included. Field-measured short-window intensity at any given site will always be worse than the analytical floor — sometimes substantially worse for native real-time intensity products that depend on weighing-gauge dynamic response.

Read this before reading the table. The rankings below come from a deterministic mathematical model (analytical floor) using only public datasheet inputs. The same model would produce the same numbers if any other party ran it. Within any product class, the row that wins is the one with the smallest combined boundary-state and per-tip stochastic uncertainty. The Lambrecht hi-resolution state-model rows sit at the top of the table because they have the smallest mathematical state resolution (0.001 mm). They are model-potential layers — defensible real-time intensity claims require measured weighing response time, filter bandwidth, and self-emptying-correction interval, which the public datasheet does not constrain. The defensible Lambrecht row at this horizon is the public envelope further down. Field performance is a separate question not addressed here.

Why intensity needs its own ranking

For rainfall-rate terminology such as light, moderate, heavy, and violent rain, see the rain-rate intensity classification.

Short-window intensity is a live measurement problem; the reporting intervals and error concepts are introduced in the rainfall-rate and rain-intensity error guide. The reporting window — a 1-minute, 10-minute, or rolling 30-minute interval — usually sits inside an active rain event, with both window boundaries bracketed by observed tips. For a tipping bucket that transmits a B-bit phase code on each tip (the MeteoRain IoT³ family transmits B = 3, resolving the inter-tip residual to 1/8 of a tip), this means the boundary residual at both ends of the window is resolved to the phase-code resolution rather than the full tip depth. This is the B3/B3 interior bound in the model, and it is dramatically smaller than the wired equivalent of the same hardware. For accumulation totals over a daily window — where the rain event start and end sit in dry conditions with no adjacent tips to anchor the residual — the phase code does not help (see the companion accumulation ranking).

30 minutes is genuinely dual-use. A rolling 30-minute intensity reading during active rain belongs in this intensity ranking (B3/B3, both ends bracketed by tips). A fixed 4:00–4:30 PM accumulation slot — for example a typical Florida summer afternoon thunderstorm — belongs in the accumulation ranking (B0/B0, event start/end unresolved). The two rankings give different positions for the IoT³ family even at the same nominal 30-minute horizon.

Visual summary before the table

This chart gives the fastest visual read of the ranked rows before the full table. Shorter bars mean less rainfall is needed before the product reaches the 1% uncertainty target. The chart is regenerated from the ranked numeric rows; not-ranked amount-only, RT-only, and reference rows are listed at the bottom of the table and omitted from the plot.

Figure 1. Required rainfall depth at the 1% target across the 90 ranked numeric rows, generated directly from the updated Overall ranking table. N/R rows remain in the table but are not plotted.

Overall ranking — 90 ranked rows plus 11 N/R reference rows

Rows marked N/R are placed at the bottom because their public documentation does not provide a transparent required-depth short-window intensity floor. They may be appropriate for amount totals, native RT fixed-floor output, historical reference, or static/filtered weighing use, depending on the row.

Sorted by required depth at 1%. Lower is better. The category badge in the product column shows the row family. Lambrecht hi-resolution state-model rows are included with yellow shading to signal "model only — requires response gating before being treated as a real-time claim." Ties marked with a "T" suffix on the rank.

Table navigation: scroll left and right inside the table box to see all columns. The rank and gauge columns remain pinned; notes and technical evidence columns sit farther to the right.

Overall rank	Gauge / output product	P_min at 1% (mm)	P_min at 2% (mm)	1% @1 min (mm/h)	1% @10 min (mm/h)	1% @30 min (mm/h)	1% @1 h (mm/h)	1% @3 h (mm/h)	Δ_res (mm)	Evidence layer	State detail	A (cm²)	d / d_eq (mm)	V_s (mL)	Why it ranks here
1	Model only Lambrecht rain[e]400 — 0.001 mm hi-res scale-state model	0.635	0.166	38.13	3.81	1.27	0.635	0.212	0.001	rain[e] hi-res state model	scale state: ≈6.64 bits	400	0.1	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
2	Model only Lambrecht rain[e]314 — 0.001 mm hi-res scale-state model	0.804	0.207	48.27	4.83	1.61	0.804	0.268	0.001	rain[e] hi-res state model	scale state: ≈6.99 bits	314	0.1274	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
3	IoT³ MeteoRain IoT³ 533 Classic (gen3)	1.03	0.446	62.10	6.21	2.07	1.03	0.345	0.0094 / 0.075	IoT³ TBR hybrid product	short windows: 3-bit state; daily/event totals: raw boundary	533	0.075	—	IoT³ phase-aware: B=3 transmitted phase code resolves boundary residuals to 1/8 of a tip during active rain, dramatically reducing the boundary term for short-window intensity.
4	Model only Lambrecht rain[e]400 — 0.01 mm hi-res pulse-state model	1.19	0.494	71.22	7.12	2.37	1.19	0.396	0.01	rain[e] hi-res state model	pulse state: ≈3.32 bits	400	0.1	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
5	Model only Lambrecht rain[e] / rain[e]LP / rain[e]H3 — 0.001 mm hi-res scale-state model	1.25	0.318	75.30	7.53	2.51	1.25	0.418	0.001	rain[e] hi-res state model	scale state: ≈7.64 bits	200	0.2	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
6	Model only Lambrecht rain[e]314 — 0.01 mm hi-res pulse-state model	1.31	0.52	78.36	7.84	2.61	1.31	0.435	0.01	rain[e] hi-res state model	pulse state: ≈3.67 bits	314	0.1274	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
7	IoT³ MeteoRain IoT³ 400 Aero (gen3)	1.38	0.594	82.80	8.28	2.76	1.38	0.46	0.0125 / 0.100	IoT³ TBR hybrid product	short windows: 3-bit state; daily/event totals: raw boundary	400	0.1	—	IoT³ phase-aware: B=3 transmitted phase code resolves boundary residuals to 1/8 of a tip during active rain, dramatically reducing the boundary term for short-window intensity.
8	Model only Lambrecht rain[e] / rain[e]LP / rain[e]H3 — 0.01 mm hi-res pulse-state model	1.65	0.593	99.18	9.92	3.31	1.65	0.551	0.01	rain[e] hi-res state model	pulse state: ≈4.32 bits	200	0.2	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
9	IoT³ MeteoRain IoT³ 200 Pro 0.2 mm (gen3)	2.76	1.19	165.60	16.56	5.52	2.76	0.92	0.0250 / 0.200	IoT³ TBR hybrid product	short windows: 3-bit state; daily/event totals: raw boundary	200	0.2	—	IoT³ phase-aware: B=3 transmitted phase code resolves boundary residuals to 1/8 of a tip during active rain, dramatically reducing the boundary term for short-window intensity.
10	IoT³ MeteoRain IoT³ 200 Pro 0.254 mm / 0.01 in (gen3)	3.13	1.43	187.86	18.79	6.26	3.13	1.04	0.0318 / 0.254	IoT³ TBR hybrid product	short windows: 3-bit state; daily/event totals: raw boundary	200	0.254	—	IoT³ phase-aware: B=3 transmitted phase code resolves boundary residuals to 1/8 of a tip during active rain, dramatically reducing the boundary term for short-window intensity.
11	TBR MeteoRain 533 Classic	6.36	3.12	381.78	38.18	12.73	6.36	2.12	0.075	pulse-output TBR	raw pulse	533	0.075	—	Wired pulse output (B=0); no phase-code advantage. For short-window intensity, ranked by tip depth and collector area only.
12	TBR Précis Mécanique 3039/1 dynamic-bucket gauge 1000 cm² 0.1 mm	8.22	4.10	492.91	49.29	16.43	8.22	2.74	0.1	pulse-output TBR	raw pulse	1000	0.1	—	Large 1000 cm² collector lowers the drop-count floor. The dynamic-bucket mechanism is modeled here as a pulse-output TBR because the ranking uses public resolution and collector area, not a vendor-specific dynamic correction.
13	TBR KISTERS/HyQuest TB6 0.1 mm special catch	8.293	4.114	497.56	49.76	16.59	8.293	2.764	0.1	WMO / public exact TBR row	straight-through raw pulse; no siphon	628.3	0.1	—	TB6 special-catch 0.1 mm row; straight-through design, no siphon-storage term.
14T	TBR Meteoservis MR3H-FC / MR3H 500 cm² 0.1 mm	8.367	4.133	502.04	50.20	16.73	8.367	2.789	0.1	WMO / public exact TBR row	raw pulse	500	0.1	—	Meteoservis MR3H-FC/MR3H 500 cm² / 0.1 mm row.
14T	WMO AP23 / PAAR 500 cm² 0.1 mm	8.367	4.133	502.04	50.20	16.73	8.367	2.789	0.1	WMO historical exact-model TBR row	raw pulse	500	0.1	—	WMO/historical 500 cm² / 0.1 mm class; exact-model history, not a current product recommendation.
16	TBR Texas/Campbell TR-525M / TE525MM 245 mm 0.1 mm	8.39	4.14	503.58	50.36	16.79	8.39	2.80	0.1	pulse-output TBR	raw pulse	471.4	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
17T	TBR CAE PG4i 400 cm² 0.1 mm	8.48	4.16	508.98	50.90	16.97	8.48	2.83	0.1	pulse-output TBR	raw pulse	400	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
17T	TBR Casella TBRG 400 cm² 0.1 mm	8.48	4.16	508.98	50.90	16.97	8.48	2.83	0.1	pulse-output TBR	raw pulse	400	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
17T	TBR MeteoRain 400 Aero	8.48	4.16	508.98	50.90	16.97	8.48	2.83	0.1	pulse-output TBR	raw pulse	400	0.1	—	Wired pulse output (B=0); no phase-code advantage. For short-window intensity, ranked by tip depth and collector area only.
20T	TBR EML / In-Situ / Campbell ARG314 314 cm² 0.1 mm	8.69	4.21	521.27	52.13	17.38	8.69	2.90	0.1	pulse-output TBR	raw pulse	314	0.1	—	Aerodynamic 314 cm² tipping-bucket class; no siphon storage modeled. Same analytic class as 200 mm diameter / 0.1 mm gauges.
20T	TBR Honde / Renke 200 mm diameter 0.1 mm class	8.69	4.21	521.24	52.12	17.37	8.69	2.90	0.1	pulse-output TBR	raw pulse	314.2	0.1	—	Grouped 200 mm diameter low-cost/OEM products with published 0.1 mm configurations. Ranking is based only on public diameter and pulse resolution; field calibration and build quality are not scored.
20T	TBR Texas TR-525-W2 200 mm 0.1 mm	8.69	4.21	521.22	52.12	17.37	8.69	2.90	0.1	pulse-output TBR	raw pulse	314.2	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
23T	TBR Lambrecht 15189 / LB-15188 / 1518H3 0.1 mm	9.51	4.41	570.60	57.06	19.02	9.51	3.17	0.1	pulse-output TBR	raw pulse	200	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
23T	TBR MicroStep/Meteoservis MR2 200 cm² 0.1 mm option	9.51	4.41	570.60	57.06	19.02	9.51	3.17	0.1	pulse-output TBR	raw pulse	200	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
23T	TBR Thies PT 5.4032.35.008 200 cm² 0.1 mm	9.51	4.407	570.61	57.06	19.02	9.51	3.17	0.1	WMO / public exact TBR row	raw pulse	200	0.1	—	Thies PT 200 cm² / 0.1 mm exact row.
23T	TBR Zoglab RG100 200 cm² 0.1 mm	9.51	4.41	570.61	57.06	19.02	9.51	3.17	0.1	pulse-output TBR	raw pulse	200	0.1	—	Zoglab RG100 public page lists 200 cm² collection area and 0.1 mm resolution. Aero-cone / wind-reduction claims are not scored in the analytical floor.
27T	Historical Theodor Friedrichs 7011/7013 Hellmann recording rain gauge	10.00	5.00	600.00	60.00	20.00	10.00	3.33	0.1	historical float/siphon recording reference	200 cm² Hellmann recorder; 0.1 mm chart resolution; 10 mm siphon reset	200	—	—	Historical chart-recording gauge with 200 cm² orifice and 0.1 mm chart resolution. Useful as a historical accumulation reference; not a modern electronic real-time intensity product.
27T	Weighing Lambrecht rain[e] / rain[e]LP / rain[e]314 / rain[e]400 / rain[e]H3 public amount-total	10.00	5.00	600.00	60.00	20.00	10.00	3.33	—	weighing public envelope	public fixed floor	—	—	—	Weighing public envelope: ±0.1 mm or ±1% amount accuracy floor. The native real-time intensity product (Pluvio² S Intensity RT, rain[e] native 1-min) has a separate ±6 mm/h floor — see "Where weighing fits" below.
27T	Weighing OTT Pluvio² L Accu NRT / Accu total NRT	10.00	5.00	600.00	60.00	20.00	10.00	3.33	—	weighing public envelope	NRT amount product	—	—	—	Weighing public envelope: ±0.1 mm or ±1% amount accuracy floor. The native real-time intensity product (Pluvio² S Intensity RT, rain[e] native 1-min) has a separate ±6 mm/h floor — see "Where weighing fits" below.
27T	Weighing OTT Pluvio² S Accu NRT / Accu total NRT	10.00	5.00	600.00	60.00	20.00	10.00	3.33	—	weighing public envelope	NRT amount product	—	—	—	Weighing public envelope: ±0.1 mm or ±1% amount accuracy floor. The native real-time intensity product (Pluvio² S Intensity RT, rain[e] native 1-min) has a separate ±6 mm/h floor — see "Where weighing fits" below.
31T	TBR CAE PMB2 / PMB2/R 1000 cm² 0.2 mm	16.35	8.17	981.30	98.13	32.71	16.35	5.45	0.2	pulse-output TBR	raw pulse; correction algorithm not modelled	1000	0.2	—	1000 cm² / 0.2 mm tipping-bucket row. The public datasheet describes a compensation algorithm; this transparent table does not apply unpublished or product-specific correction details.
31T	TBR ETG R102 1000 cm² 0.2 mm	16.35	8.17	981.30	98.13	32.71	16.35	5.45	0.2	pulse-output TBR	raw pulse; correction algorithm not modelled	1000	0.2	—	1000 cm² / 0.2 mm tipping-bucket row with published correction algorithm. Ranked here from collector area and tip depth only so it remains comparable with other public-datasheet rows.
31T	WMO MTX PP040 1000 cm² 0.2 mm	16.35	8.171	981.30	98.13	32.71	16.35	5.452	0.2	WMO historical exact-model TBR row	raw pulse	1000	0.2	—	1000 cm² / 0.2 mm class; retain range-gate caution from WMO validation layer.
31T	WMO R01 3070 / Précis-Mécanique 1000 cm² 0.2 mm	16.35	8.171	981.30	98.13	32.71	16.35	5.452	0.2	WMO historical exact-model TBR row	raw pulse	1000	0.2	—	Distinct from the Précis 3039/1 1000 cm² / 0.1 mm row; WMO/historical 0.2 mm model.
31T	WMO SIAP+MICROS TP1000 / SIAP UM7525 / T-PLUV UM7525/I 1000 cm² 0.2 mm	16.35	8.171	981.30	98.13	32.71	16.35	5.452	0.2	WMO historical exact-model TBR row	raw pulse	1000	0.2	—	1000 cm² / 0.2 mm WMO/historical class.
36T	TBR SIAP+MICROS TP500 500 cm² 0.2 mm	16.43	8.19	986	98.58	32.86	16.43	5.48	0.2	pulse-output TBR	raw pulse; no siphon	500	0.2	—	Current SIAP+MICROS TP500 row. Manual lists 500 cm² collecting area and 0.2 mm/impulse conversion constant; correction electronics are noted but not applied because the transparent ranking uses public collector area and tip depth.
36T	TBR Vaisala QMR102 / EML ARG100 / Campbell ARG100 500 cm² 0.2 mm	16.43	8.19	985.80	98.58	32.86	16.43	5.48	0.2	pulse-output TBR	raw pulse	500	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
38	TBR Casella TBRG / CEL 100000E 400 cm² 0.2 mm	16.49	8.20	989.40	98.94	32.98	16.49	5.50	0.2	pulse-output TBR	raw pulse	400	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
39T	TBR FTS/AEM RG-T 0.2 mm option	16.57	8.225	994.16	99.42	33.14	16.57	5.523	0.2	WMO / public exact TBR row	raw pulse	324.3	0.2	—	FTS/AEM RG-T optional metric row; same analytical class as 8 in / 324 cm² 0.2 mm gauges.
39T	TBR LSI Lastem DQA031 324 cm² 0.2 mm	16.57	8.225	994.16	99.42	33.14	16.57	5.523	0.2	WMO / public exact TBR row	raw pulse	324.3	0.2	—	324 cm² / 0.2 mm exact row.
39T	TBR Met One 370D 324 cm² 0.2 mm	16.57	8.22	994.20	99.42	33.14	16.57	5.52	0.2	pulse-output TBR	raw pulse	324	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
39T	TBR RainWise wireless metric 8 in 0.2 mm	16.57	8.22	994.20	99.42	33.14	16.57	5.52	0.2	pulse-output TBR	raw pulse	324.3	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
39T	TBR Texas TR-525USW 8 in 0.2 mm	16.57	8.22	994.20	99.42	33.14	16.57	5.52	0.2	pulse-output TBR	raw pulse	324.3	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
44T	TBR EML / In-Situ / Campbell ARG314 314 cm² 0.2 mm	16.59	8.23	995.13	99.51	33.17	16.59	5.53	0.2	pulse-output TBR	raw pulse	314	0.2	—	Aerodynamic 314 cm² tipping-bucket class; standard 0.2 mm metric configuration.
44T	TBR KISTERS/HyQuest TB6 0.2 mm	16.59	8.229	995.11	99.51	33.17	16.59	5.528	0.2	WMO / public exact TBR row	straight-through raw pulse; no siphon	314.2	0.2	—	TB6 standard 0.2 mm row; no siphon-storage term.
44T	TBR KISTERS/HyQuest TB7 200 mm 0.2 mm	16.59	8.23	995	99.51	33.17	16.59	5.53	0.2	pulse-output TBR	raw pulse; no siphon	314.2	0.2	—	New-generation non-syphoning TB7 row. KISTERS lists 200 mm catch diameter and 0.2 mm resolution; modeled as raw pulse because the public page identifies the type as non-syphoning.
44T	TBR Rika / Honde / Renke 200 mm diameter 0.2 mm class	16.59	8.23	995.11	99.51	33.17	16.59	5.53	0.2	pulse-output TBR	raw pulse	314.2	0.2	—	Grouped 200 mm diameter / 0.2 mm pulse-output class. Many products in this class share the same analytical floor; manufacturer envelope and calibration remain separate.
44T	TBR Texas TR-525-W2 200 mm 0.2 mm	16.59	8.23	995.40	99.54	33.18	16.59	5.53	0.2	pulse-output TBR	raw pulse	314.2	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
49	TBR Davis 6466/6466M AeroCone 214 cm² 0.2 mm	16.88	8.30	1012.80	101.28	33.76	16.88	5.63	0.2	pulse-output TBR	raw pulse	214	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
50	TBR METER ECRN-100 16 cm collector 0.2 mm	16.96	8.32	1017.60	101.76	33.92	16.96	5.65	0.2	pulse-output TBR	raw pulse	201.1	0.2	—	Double-spoon pulse gauge with 16 cm collector diameter and 0.2 mm/tip. Its analytical floor is nearly the same as the 200 cm² / 0.2 mm class.
51T	TBR Lambrecht 15189 0.2 mm	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
51T	TBR MeteoRain 200 Pro 0.2 mm	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Wired pulse output (B=0); no phase-code advantage. For short-window intensity, ranked by tip depth and collector area only.
51T	TBR MicroStep/Meteoservis MR2 200 cm² 0.2 mm	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
51T	TBR Seven Sensor Solutions 3S-RG 0.2 mm — no siphon	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
51T	TBR SIAP+MICROS TP200 200 cm² 0.2 mm	16.97	8.32	1018.01	101.80	33.93	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	SIAP+MICROS TP200 technical sheet lists 200 cm² collecting area and 0.2 mm/impulse. TP200-E correction electronics are noted but not used in the transparent ranking unless the correction algorithm is public.
51T	TBR Vaisala QMR101 / Pronamic Professional 0.2 mm	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
57	TBR Onset HOBO RG3-M 15.39 cm 0.2 mm	17.07	8.35	1024.20	102.42	34.14	17.07	5.69	0.2	pulse-output TBR	raw pulse	186	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
58	Siphon KISTERS/HyQuest TB3/TB4/CS700 0.1 mm — siphon Vs=12 mL	17.73	8.83	1063.80	106.38	35.46	17.73	5.91	0.1	siphon TBR	raw pulse + siphon	628.3	0.1	12	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
59	Siphon Observator / RIMCO RIM-7499 siphon 0.2 mm	18.50	9.19	1109.86	110.99	37.00	18.50	6.17	0.2	siphon TBR	raw pulse + siphon	323.7	0.2	3.2	Siphon-controlled 203 mm tipping-bucket gauge. Siphon storage is estimated as half of the bucket volume for the configured tip depth and included with γs = 1 as a conservative unresolved storage term.
60	TBR EML ARG100 optional 0.25 mm	20.49	10.23	1229.40	122.94	40.98	20.49	6.83	0.25	pulse-output TBR	raw pulse	500	0.25	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
61T	TBR AEM/FTS 2408 8 in 0.01 in	20.93	10.42	1255.80	125.58	41.86	20.93	6.98	0.254	pulse-output TBR	raw pulse	324.3	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
61T	TBR FTS/AEM RG-T 0.01 in / 0.254 mm	20.93	10.42	1255.62	125.56	41.85	20.93	6.976	0.254	WMO / public exact TBR row	raw pulse	324.3	0.254	—	FTS/AEM RG-T imperial row; same analytical class as 8 in / 0.01 in gauges.
61T	TBR RainWise Rainew 8 in 0.01 in	20.93	10.42	1255.80	125.58	41.86	20.93	6.98	0.254	pulse-output TBR	raw pulse	324.3	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
61T	TBR Texas/Campbell TR-525WS / TE525WS 8 in 0.01 in	20.93	10.42	1255.80	125.58	41.86	20.93	6.98	0.254	pulse-output TBR	raw pulse	324.3	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
61T	TBR WaterLOG / Design Analysis H-340SDI 8 in 0.01 in	20.93	10.42	1255.62	125.56	41.85	20.93	6.976	0.254	WMO / public exact TBR row	raw pulse	324.3	0.254	—	8 in / 0.01 in WaterLOG/Design Analysis row.
66T	TBR KISTERS/HyQuest TB6 0.01 in / 0.254 mm	20.94	10.42	1256.36	125.64	41.88	20.94	6.98	0.254	WMO / public exact TBR row	straight-through raw pulse; no siphon	314.2	0.254	—	TB6 0.01 in row; no siphon-storage term.
66T	TBR KISTERS/HyQuest TB7 200 mm 0.01 in / 0.254 mm	20.94	10.42	1256	126	41.88	20.94	6.98	0.254	pulse-output TBR	raw pulse; no siphon	314.2	0.254	—	New-generation non-syphoning TB7 row. KISTERS lists 200 mm catch diameter and 0.01 inch resolution; modeled as raw pulse because the public page identifies the type as non-syphoning.
68	TBR Davis 6466/6466M AeroCone / Rain Collector II 7852 214 cm² 0.01 in	21.17	10.48	1270.20	127.02	42.34	21.17	7.06	0.254	pulse-output TBR	raw pulse	214	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
69	TBR MeteoRain 200 Pro 0.254 mm / 0.01 in	21.24	10.49	1274.40	127.44	42.48	21.24	7.08	0.254	pulse-output TBR	raw pulse	200	0.254	—	Wired pulse output (B=0); no phase-code advantage. For short-window intensity, ranked by tip depth and collector area only.
70	TBR Onset HOBO RG3 15.39 cm 0.01 in	21.32	10.51	1279.20	127.92	42.64	21.32	7.11	0.254	pulse-output TBR	raw pulse	186	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
71	TBR Texas/Campbell TR-525 / TE525 6 in 0.01 in	21.34	10.52	1280.40	128.04	42.68	21.34	7.11	0.254	pulse-output TBR	raw pulse	182.4	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
72	Siphon Observator / RIMCO RIM-7499 siphon 0.25 mm	23.01	11.46	1380.81	138.08	46.03	23.01	7.67	0.25	siphon TBR	raw pulse + siphon	323.7	0.2	4.0	Siphon-controlled 203 mm tipping-bucket gauge. Siphon storage is estimated as half of the bucket volume for the configured tip depth and included with γs = 1 as a conservative unresolved storage term.
73	Siphon Geolux RG400 0.1 mm — siphon Vs≈16 mL, 4 mL/tip	33.98	16.91	2038.80	203.88	67.96	33.98	11.33	0.1	siphon TBR	raw pulse + siphon	400	0.1	16	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
74	Siphon KISTERS/HyQuest TB3/TB4/CS700 0.2 mm — siphon Vs=12 mL	35.45	17.66	2127.00	212.70	70.90	35.45	11.82	0.2	siphon TBR	raw pulse + siphon	314.2	0.2	12	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
75	Siphon Hydrological Services TB-3 0.2 mm siphon — exact WMO row, s = 0.4 mm	36.77	18.32	2206.14	220.61	73.54	36.77	12.26	0.4472	WMO historical exact siphon TBR row	raw pulse + siphon	314.2	0.2	12.57 s=0.4 mm	TB-3 exact WMO/historical row uses the published siphon rainfall-depth term s = 0.4 mm.
76	Siphon Geolux RG200 0.2 mm — siphon Vs≈8 mL, 4 mL/tip	37.15	18.41	2229.00	222.90	74.30	37.15	12.38	0.2	siphon TBR	raw pulse + siphon	200	0.2	8	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
77	Siphon KISTERS/HyQuest TB3/TB4 / Campbell CS700/CS700H 0.01 in — siphon Vs=12 mL	37.65	18.78	2259.00	225.90	75.30	37.65	12.55	0.254	siphon TBR	raw pulse + siphon	314.2	0.254	12	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
78	TBR Casella TBRG 400 cm² 0.5 mm	40.89	20.43	2453.40	245.34	81.78	40.89	13.63	0.5	pulse-output TBR	raw pulse	400	0.5	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
79T	TBR EML / In-Situ ARG314 314 cm² 0.5 mm option	40.93	20.44	2455.58	245.56	81.85	40.93	13.64	0.5	pulse-output TBR	raw pulse	314	0.5	—	Optional coarse-resolution ARG314 configuration; included as a technical comparison because 0.5 mm tips are less suitable for short-window precision.
79T	TBR KISTERS/HyQuest TB6 0.5 mm	40.93	20.44	2455.57	245.56	81.85	40.93	13.64	0.5	Technical low-resolution TBR row	straight-through raw pulse; no siphon	314.2	0.5	—	TB6 coarse 0.5 mm option retained as a technical comparison row.
79T	TBR KISTERS/HyQuest TB7 200 mm 0.5 mm	40.93	20.44	2456	246	81.85	40.93	13.64	0.5	pulse-output TBR	raw pulse; no siphon	314.2	0.5	—	New-generation non-syphoning TB7 row. KISTERS lists 200 mm catch diameter and 0.5 mm resolution; modeled as raw pulse because the public page identifies the type as non-syphoning.
79T	TBR Rika / Honde / Renke / Tamaya 200 mm diameter 0.5 mm class	40.93	20.44	2455.58	245.56	81.85	40.93	13.64	0.5	pulse-output TBR	raw pulse	314.2	0.5	—	Grouped 200 mm diameter / 0.5 mm pulse-output class. The coarse tip depth dominates the analytical floor.
79T	WMO India Met Dept. TBRG Mk2 314 cm² 0.5 mm	40.93	20.44	2455.57	245.56	81.85	40.93	13.64	0.5	WMO historical technical TBR row	raw pulse	314.2	0.5	—	WMO historical 314 cm² / 0.5 mm technical row.
84T	TBR IMD / Astra-type 200 cm² TBRG 0.5 mm	41.08	20.48	2464.80	246.48	82.16	41.08	13.69	0.5	pulse-output TBR	raw pulse	200	0.5	—	IMD/AWS training source lists Astra TBRG collector diameter 159.6 mm, collector area 200 cm², 0.5 mm resolution, and 10 mL per tip. Modeled as raw pulse, no siphon.
84T	TBR MicroStep/Meteoservis MR2 200 cm² 0.5 mm option	41.08	20.48	2464.80	246.48	82.16	41.08	13.69	0.5	pulse-output TBR	raw pulse	200	0.5	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
86	Siphon Observator / RIMCO RIM-7499 siphon 0.5 mm	45.74	22.85	2744.35	274.43	91.48	45.74	15.25	0.5	siphon TBR	raw pulse + siphon	323.7	0.5	8.1	Siphon-controlled 203 mm tipping-bucket gauge. Siphon storage is estimated as half of the bucket volume for the configured tip depth and included with γs = 1 as a conservative unresolved storage term.
87	Siphon KISTERS/HyQuest TB3/TB4 0.5 mm siphon Vs=12 mL	51.47	25.71	3088.41	308.84	102.95	51.47	17.16	0.6292	Technical low-resolution siphon TBR row	raw pulse + siphon	314.2	0.5	12	Coarse TB3/TB4 0.5 mm siphon row with Vs = 12 mL retained for technical completeness.
88T	TBR KISTERS/HyQuest TB6 1.0 mm	81.70	40.84	4902.02	490.20	163.40	81.70	27.23	1	Technical low-resolution TBR row	straight-through raw pulse; no siphon	314.2	1	—	TB6 coarse 1.0 mm option retained as a low-resolution technical comparison row.
88T	WMO Yokogawa Denshi Kiki WMB01 314 cm² 1.0 mm	81.70	40.84	4902.02	490.20	163.40	81.70	27.23	1	WMO historical technical TBR row	raw pulse	314.2	1	—	WMO historical 314 cm² / 1.0 mm low-resolution technical row.
90	Siphon KISTERS/HyQuest TB3/TB4 1.0 mm siphon Vs=12 mL	87.45	43.71	5247.16	524.72	174.91	87.45	29.15	1.07	Technical low-resolution siphon TBR row	raw pulse + siphon	314.2	1	12	Coarse TB3/TB4 1.0 mm siphon row with Vs = 12 mL retained for technical completeness.
N/R	Unranked Lambrecht rain[e]one Modbus public amount-total	—	—	—	—	—	—	—	—	not ranked — amount-total weighing product	Modbus amount/total output; not a transparent short-window intensity ranking row	—	—	—	Not suitable for this required-depth short-window intensity ranking. This row is a Modbus amount/total weighing product reference: public amount accuracy is ±0.1 mm or 2%, while native intensity uses a separate fixed floor of ±0.1 mm/min or ±6 mm/h. Use it for amount/total context, not as a transparent dynamic intensity threshold row.
N/R	Unranked OTT Pluvio² L Intensity RT	—	—	—	—	—	—	—	—	not ranked — native RT weighing intensity output	fixed-floor 1-minute RT output; not a required-depth stochastic row	—	—	—	Not ranked by this required-depth catchment-table metric. OTT Intensity RT is a native 1-minute fixed-floor intensity output, not an amount-derived depth-threshold row. Use the published ±0.1 mm/min, ±6 mm/h, or ±1% floor separately.
N/R	Unranked OTT Pluvio² S Intensity RT	—	—	—	—	—	—	—	—	not ranked — native RT weighing intensity output	fixed-floor 1-minute RT output; not a required-depth stochastic row	—	—	—	Not ranked by this required-depth catchment-table metric. OTT Intensity RT is a native 1-minute fixed-floor intensity output, not an amount-derived depth-threshold row. Use the published ±0.1 mm/min, ±6 mm/h, or ±1% floor separately.
N/R	Unranked MPS / MicroStep-MIS TRwS	—	—	—	—	—	—	—	—	not ranked — weighing/reference product	not suitable for transparent short-window intensity ranking from public specifications	—	—	—	No public time constant, filter kernel, raw/filtered weighing noise, output delay, or residual compensation error sufficient for a transparent 1-minute or 10-minute dynamic ranking. Static / filtered weighing reference only; not ranked for short-window intensity.
N/R	Unranked Apogee Cloudburst SG-400 series	—	—	—	—	—	—	—	—	not ranked — weighing/reference product	not suitable for transparent short-window intensity ranking from public specifications	—	—	—	The public documents do not publish the dynamic response model needed to verify how the filtered weighing signal responds to changing rainfall intensity. Static weighing-total / public-envelope reference; not ranked as a short-window dynamic intensity gauge.
N/R	Unranked Geonor T-200B	—	—	—	—	—	—	—	—	not ranked — weighing/reference product	not suitable for transparent short-window intensity ranking from public specifications	—	—	—	The manual supports total precipitation and rate reporting through the data-acquisition system, but it does not provide a public dynamic time constant/filter/noise model for a reproducible short-window intensity floor. Historical weighing reference; not ranked as a transparent short-window intensity gauge.
N/R	Unranked FTS/AEM SDI-RAINE-HYDRO	—	—	—	—	—	—	—	—	not ranked — weighing/reference product	not suitable for transparent short-window intensity ranking from public specifications	—	—	—	No public filter kernel, raw/filtered noise, output-delay model, or step/ramp response sufficient for transparent dynamic ranking. Weighing/self-emptying precipitation reference; not a stronger dynamic rank.
N/R	Unranked FTS/AEM AWP all-weather precipitation gauge	—	—	—	—	—	—	—	—	not ranked — weighing/reference product	not suitable for transparent short-window intensity ranking from public specifications	—	—	—	No full public dynamic model converting static resolution or filtering into a transparent changing-rain measurement floor. Static/filtered weighing reference only.
N/R	Unranked Meteoservis MRW500	—	—	—	—	—	—	—	—	not ranked — weighing/reference product	not suitable for transparent short-window intensity ranking from public specifications	—	—	—	Exact public time constant/filter/noise model was not extracted from final WMO tables. Historical WMO reference; not a modern transparent dynamic ranking row.
N/R	Unranked WMO weighing references: VRG101, older OTT Pluvio / Pluvio 250, PG200, MPA-1M	—	—	—	—	—	—	—	—	not ranked — weighing/reference product	not suitable for transparent short-window intensity ranking from public specifications	—	—	—	Instrument-specific response, filter, and processing details are not represented by a single public row in this article. Reference-only WMO validation context.
N/R	Unranked SIAP+MICROS TPW / TPWE weighing rain and snow gauges	—	—	—	—	—	—	—	—	not ranked — weighing/reference product	not suitable for transparent short-window intensity ranking from public specifications	—	—	—	No public time constant, filter kernel, raw/filtered weighing noise, output delay, residual compensation error, or step/ramp response sufficient for transparent 1-minute or 10-minute dynamic ranking. Static / filtered weighing reference only; not ranked for short-window intensity.

Within-category rankings

The same rows grouped by family, so within-class comparisons are immediate. Within-class ranks are computed within that family only.

Column legend (applies to overall and per-category tables)

Within each category, the table is sorted by required depth at 1% (lower is better). The within-class rank shows where each product sits within its own family. Δ_res is the unresolved leftover-water resolution (mm). A is collector area (cm²). d / d_eq is tip depth or equivalent self-emptying event depth (mm). V_s is siphon storage volume (mL). The 1% @ 1 min through @ 3 h columns convert the 1% required depth into average rainfall rate (mm/h) over that horizon — the rate a true rainfall would have to sustain over that window for the analytical floor to deliver 1% accuracy. Columns with the slightly darker grey background are technical audit data; the main accuracy comparison is in the leftmost numerical columns.

Tipping bucket gauges (raw pulse, IoT³, and WMO exact-model rows) — 69 rows

For short-window intensity during active rain, the IoT³ rows use the B3/B3 interior bound (both window edges bracketed by transmitted phase-coded tips). The raw-pulse (wired B=0) rows use the same hardware floor as accumulation — no phase-code advantage. Within this category, IoT³ phase-aware rows on a given hardware (e.g. 533 Classic) sit dramatically below the wired equivalent for short-window intensity; for accumulation totals they tie (see the companion accumulation ranking).

Table navigation: scroll left and right inside the table box to see all columns. The rank and gauge columns remain pinned; notes and technical evidence columns sit farther to the right.

In-class rank	Gauge / output product	P_min at 1% (mm)	P_min at 2% (mm)	1% @1 min (mm/h)	1% @10 min (mm/h)	1% @30 min (mm/h)	1% @1 h (mm/h)	1% @3 h (mm/h)	Δ_res (mm)	Evidence layer	State detail	A (cm²)	d / d_eq (mm)	V_s (mL)	Why it ranks here
1	IoT³ MeteoRain IoT³ 533 Classic (gen3)	1.03	0.446	62.10	6.21	2.07	1.03	0.345	0.0094 / 0.075	IoT³ TBR hybrid product	short windows: 3-bit state; daily/event totals: raw boundary	533	0.075	—	IoT³ phase-aware: B=3 transmitted phase code resolves boundary residuals to 1/8 of a tip during active rain, dramatically reducing the boundary term for short-window intensity.
2	IoT³ MeteoRain IoT³ 400 Aero (gen3)	1.38	0.594	82.80	8.28	2.76	1.38	0.46	0.0125 / 0.100	IoT³ TBR hybrid product	short windows: 3-bit state; daily/event totals: raw boundary	400	0.1	—	IoT³ phase-aware: B=3 transmitted phase code resolves boundary residuals to 1/8 of a tip during active rain, dramatically reducing the boundary term for short-window intensity.
3	IoT³ MeteoRain IoT³ 200 Pro 0.2 mm (gen3)	2.76	1.19	165.60	16.56	5.52	2.76	0.92	0.0250 / 0.200	IoT³ TBR hybrid product	short windows: 3-bit state; daily/event totals: raw boundary	200	0.2	—	IoT³ phase-aware: B=3 transmitted phase code resolves boundary residuals to 1/8 of a tip during active rain, dramatically reducing the boundary term for short-window intensity.
4	IoT³ MeteoRain IoT³ 200 Pro 0.254 mm / 0.01 in (gen3)	3.13	1.43	187.86	18.79	6.26	3.13	1.04	0.0318 / 0.254	IoT³ TBR hybrid product	short windows: 3-bit state; daily/event totals: raw boundary	200	0.254	—	IoT³ phase-aware: B=3 transmitted phase code resolves boundary residuals to 1/8 of a tip during active rain, dramatically reducing the boundary term for short-window intensity.
5	TBR MeteoRain 533 Classic	6.36	3.12	381.78	38.18	12.73	6.36	2.12	0.075	pulse-output TBR	raw pulse	533	0.075	—	Wired pulse output (B=0); no phase-code advantage. For short-window intensity, ranked by tip depth and collector area only.
6	TBR Précis Mécanique 3039/1 dynamic-bucket gauge 1000 cm² 0.1 mm	8.22	4.10	492.91	49.29	16.43	8.22	2.74	0.1	pulse-output TBR	raw pulse	1000	0.1	—	Large 1000 cm² collector lowers the drop-count floor. The dynamic-bucket mechanism is modeled here as a pulse-output TBR because the ranking uses public resolution and collector area, not a vendor-specific dynamic correction.
7	TBR KISTERS/HyQuest TB6 0.1 mm special catch	8.293	4.114	497.56	49.76	16.59	8.293	2.764	0.1	WMO / public exact TBR row	straight-through raw pulse; no siphon	628.3	0.1	—	TB6 special-catch 0.1 mm row; straight-through design, no siphon-storage term.
8T	TBR Meteoservis MR3H-FC / MR3H 500 cm² 0.1 mm	8.367	4.133	502.04	50.20	16.73	8.367	2.789	0.1	WMO / public exact TBR row	raw pulse	500	0.1	—	Meteoservis MR3H-FC/MR3H 500 cm² / 0.1 mm row.
8T	WMO AP23 / PAAR 500 cm² 0.1 mm	8.367	4.133	502.04	50.20	16.73	8.367	2.789	0.1	WMO historical exact-model TBR row	raw pulse	500	0.1	—	WMO/historical 500 cm² / 0.1 mm class; exact-model history, not a current product recommendation.
10	TBR Texas/Campbell TR-525M / TE525MM 245 mm 0.1 mm	8.39	4.14	503.58	50.36	16.79	8.39	2.80	0.1	pulse-output TBR	raw pulse	471.4	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
11T	TBR CAE PG4i 400 cm² 0.1 mm	8.48	4.16	508.98	50.90	16.97	8.48	2.83	0.1	pulse-output TBR	raw pulse	400	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
11T	TBR Casella TBRG 400 cm² 0.1 mm	8.48	4.16	508.98	50.90	16.97	8.48	2.83	0.1	pulse-output TBR	raw pulse	400	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
11T	TBR MeteoRain 400 Aero	8.48	4.16	508.98	50.90	16.97	8.48	2.83	0.1	pulse-output TBR	raw pulse	400	0.1	—	Wired pulse output (B=0); no phase-code advantage. For short-window intensity, ranked by tip depth and collector area only.
14T	TBR EML / In-Situ / Campbell ARG314 314 cm² 0.1 mm	8.69	4.21	521.27	52.13	17.38	8.69	2.90	0.1	pulse-output TBR	raw pulse	314	0.1	—	Aerodynamic 314 cm² tipping-bucket class; no siphon storage modeled. Same analytic class as 200 mm diameter / 0.1 mm gauges.
14T	TBR Honde / Renke 200 mm diameter 0.1 mm class	8.69	4.21	521.24	52.12	17.37	8.69	2.90	0.1	pulse-output TBR	raw pulse	314.2	0.1	—	Grouped 200 mm diameter low-cost/OEM products with published 0.1 mm configurations. Ranking is based only on public diameter and pulse resolution; field calibration and build quality are not scored.
14T	TBR Texas TR-525-W2 200 mm 0.1 mm	8.69	4.21	521.22	52.12	17.37	8.69	2.90	0.1	pulse-output TBR	raw pulse	314.2	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
17T	TBR Lambrecht 15189 / LB-15188 / 1518H3 0.1 mm	9.51	4.41	570.60	57.06	19.02	9.51	3.17	0.1	pulse-output TBR	raw pulse	200	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
17T	TBR MicroStep/Meteoservis MR2 200 cm² 0.1 mm option	9.51	4.41	570.60	57.06	19.02	9.51	3.17	0.1	pulse-output TBR	raw pulse	200	0.1	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
17T	TBR Thies PT 5.4032.35.008 200 cm² 0.1 mm	9.51	4.407	570.61	57.06	19.02	9.51	3.17	0.1	WMO / public exact TBR row	raw pulse	200	0.1	—	Thies PT 200 cm² / 0.1 mm exact row.
17T	TBR Zoglab RG100 200 cm² 0.1 mm	9.51	4.41	570.61	57.06	19.02	9.51	3.17	0.1	pulse-output TBR	raw pulse	200	0.1	—	Zoglab RG100 public page lists 200 cm² collection area and 0.1 mm resolution. Aero-cone / wind-reduction claims are not scored in the analytical floor.
21T	TBR CAE PMB2 / PMB2/R 1000 cm² 0.2 mm	16.35	8.17	981.30	98.13	32.71	16.35	5.45	0.2	pulse-output TBR	raw pulse; correction algorithm not modelled	1000	0.2	—	1000 cm² / 0.2 mm tipping-bucket row. The public datasheet describes a compensation algorithm; this transparent table does not apply unpublished or product-specific correction details.
21T	TBR ETG R102 1000 cm² 0.2 mm	16.35	8.17	981.30	98.13	32.71	16.35	5.45	0.2	pulse-output TBR	raw pulse; correction algorithm not modelled	1000	0.2	—	1000 cm² / 0.2 mm tipping-bucket row with published correction algorithm. Ranked here from collector area and tip depth only so it remains comparable with other public-datasheet rows.
21T	WMO MTX PP040 1000 cm² 0.2 mm	16.35	8.171	981.30	98.13	32.71	16.35	5.452	0.2	WMO historical exact-model TBR row	raw pulse	1000	0.2	—	1000 cm² / 0.2 mm class; retain range-gate caution from WMO validation layer.
21T	WMO R01 3070 / Précis-Mécanique 1000 cm² 0.2 mm	16.35	8.171	981.30	98.13	32.71	16.35	5.452	0.2	WMO historical exact-model TBR row	raw pulse	1000	0.2	—	Distinct from the Précis 3039/1 1000 cm² / 0.1 mm row; WMO/historical 0.2 mm model.
21T	WMO SIAP+MICROS TP1000 / SIAP UM7525 / T-PLUV UM7525/I 1000 cm² 0.2 mm	16.35	8.171	981.30	98.13	32.71	16.35	5.452	0.2	WMO historical exact-model TBR row	raw pulse	1000	0.2	—	1000 cm² / 0.2 mm WMO/historical class.
26T	TBR SIAP+MICROS TP500 500 cm² 0.2 mm	16.43	8.19	986	98.58	32.86	16.43	5.48	0.2	pulse-output TBR	raw pulse; no siphon	500	0.2	—	Current SIAP+MICROS TP500 row. Manual lists 500 cm² collecting area and 0.2 mm/impulse conversion constant; correction electronics are noted but not applied because the transparent ranking uses public collector area and tip depth.
26T	TBR Vaisala QMR102 / EML ARG100 / Campbell ARG100 500 cm² 0.2 mm	16.43	8.19	985.80	98.58	32.86	16.43	5.48	0.2	pulse-output TBR	raw pulse	500	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
28	TBR Casella TBRG / CEL 100000E 400 cm² 0.2 mm	16.49	8.20	989.40	98.94	32.98	16.49	5.50	0.2	pulse-output TBR	raw pulse	400	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
29T	TBR FTS/AEM RG-T 0.2 mm option	16.57	8.225	994.16	99.42	33.14	16.57	5.523	0.2	WMO / public exact TBR row	raw pulse	324.3	0.2	—	FTS/AEM RG-T optional metric row; same analytical class as 8 in / 324 cm² 0.2 mm gauges.
29T	TBR LSI Lastem DQA031 324 cm² 0.2 mm	16.57	8.225	994.16	99.42	33.14	16.57	5.523	0.2	WMO / public exact TBR row	raw pulse	324.3	0.2	—	324 cm² / 0.2 mm exact row.
29T	TBR Met One 370D 324 cm² 0.2 mm	16.57	8.22	994.20	99.42	33.14	16.57	5.52	0.2	pulse-output TBR	raw pulse	324	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
29T	TBR RainWise wireless metric 8 in 0.2 mm	16.57	8.22	994.20	99.42	33.14	16.57	5.52	0.2	pulse-output TBR	raw pulse	324.3	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
29T	TBR Texas TR-525USW 8 in 0.2 mm	16.57	8.22	994.20	99.42	33.14	16.57	5.52	0.2	pulse-output TBR	raw pulse	324.3	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
34T	TBR EML / In-Situ / Campbell ARG314 314 cm² 0.2 mm	16.59	8.23	995.13	99.51	33.17	16.59	5.53	0.2	pulse-output TBR	raw pulse	314	0.2	—	Aerodynamic 314 cm² tipping-bucket class; standard 0.2 mm metric configuration.
34T	TBR KISTERS/HyQuest TB6 0.2 mm	16.59	8.229	995.11	99.51	33.17	16.59	5.528	0.2	WMO / public exact TBR row	straight-through raw pulse; no siphon	314.2	0.2	—	TB6 standard 0.2 mm row; no siphon-storage term.
34T	TBR KISTERS/HyQuest TB7 200 mm 0.2 mm	16.59	8.23	995	99.51	33.17	16.59	5.53	0.2	pulse-output TBR	raw pulse; no siphon	314.2	0.2	—	New-generation non-syphoning TB7 row. KISTERS lists 200 mm catch diameter and 0.2 mm resolution; modeled as raw pulse because the public page identifies the type as non-syphoning.
34T	TBR Rika / Honde / Renke 200 mm diameter 0.2 mm class	16.59	8.23	995.11	99.51	33.17	16.59	5.53	0.2	pulse-output TBR	raw pulse	314.2	0.2	—	Grouped 200 mm diameter / 0.2 mm pulse-output class. Many products in this class share the same analytical floor; manufacturer envelope and calibration remain separate.
34T	TBR Texas TR-525-W2 200 mm 0.2 mm	16.59	8.23	995.40	99.54	33.18	16.59	5.53	0.2	pulse-output TBR	raw pulse	314.2	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
39	TBR Davis 6466/6466M AeroCone 214 cm² 0.2 mm	16.88	8.30	1012.80	101.28	33.76	16.88	5.63	0.2	pulse-output TBR	raw pulse	214	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
40	TBR METER ECRN-100 16 cm collector 0.2 mm	16.96	8.32	1017.60	101.76	33.92	16.96	5.65	0.2	pulse-output TBR	raw pulse	201.1	0.2	—	Double-spoon pulse gauge with 16 cm collector diameter and 0.2 mm/tip. Its analytical floor is nearly the same as the 200 cm² / 0.2 mm class.
41T	TBR Lambrecht 15189 0.2 mm	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
41T	TBR MeteoRain 200 Pro 0.2 mm	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Wired pulse output (B=0); no phase-code advantage. For short-window intensity, ranked by tip depth and collector area only.
41T	TBR MicroStep/Meteoservis MR2 200 cm² 0.2 mm	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
41T	TBR Seven Sensor Solutions 3S-RG 0.2 mm — no siphon	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
41T	TBR SIAP+MICROS TP200 200 cm² 0.2 mm	16.97	8.32	1018.01	101.80	33.93	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	SIAP+MICROS TP200 technical sheet lists 200 cm² collecting area and 0.2 mm/impulse. TP200-E correction electronics are noted but not used in the transparent ranking unless the correction algorithm is public.
41T	TBR Vaisala QMR101 / Pronamic Professional 0.2 mm	16.97	8.32	1018.20	101.82	33.94	16.97	5.66	0.2	pulse-output TBR	raw pulse	200	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
47	TBR Onset HOBO RG3-M 15.39 cm 0.2 mm	17.07	8.35	1024.20	102.42	34.14	17.07	5.69	0.2	pulse-output TBR	raw pulse	186	0.2	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
48	TBR EML ARG100 optional 0.25 mm	20.49	10.23	1229.40	122.94	40.98	20.49	6.83	0.25	pulse-output TBR	raw pulse	500	0.25	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
49T	TBR AEM/FTS 2408 8 in 0.01 in	20.93	10.42	1255.80	125.58	41.86	20.93	6.98	0.254	pulse-output TBR	raw pulse	324.3	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
49T	TBR FTS/AEM RG-T 0.01 in / 0.254 mm	20.93	10.42	1255.62	125.56	41.85	20.93	6.976	0.254	WMO / public exact TBR row	raw pulse	324.3	0.254	—	FTS/AEM RG-T imperial row; same analytical class as 8 in / 0.01 in gauges.
49T	TBR RainWise Rainew 8 in 0.01 in	20.93	10.42	1255.80	125.58	41.86	20.93	6.98	0.254	pulse-output TBR	raw pulse	324.3	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
49T	TBR Texas/Campbell TR-525WS / TE525WS 8 in 0.01 in	20.93	10.42	1255.80	125.58	41.86	20.93	6.98	0.254	pulse-output TBR	raw pulse	324.3	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
49T	TBR WaterLOG / Design Analysis H-340SDI 8 in 0.01 in	20.93	10.42	1255.62	125.56	41.85	20.93	6.976	0.254	WMO / public exact TBR row	raw pulse	324.3	0.254	—	8 in / 0.01 in WaterLOG/Design Analysis row.
54T	TBR KISTERS/HyQuest TB6 0.01 in / 0.254 mm	20.94	10.42	1256.36	125.64	41.88	20.94	6.98	0.254	WMO / public exact TBR row	straight-through raw pulse; no siphon	314.2	0.254	—	TB6 0.01 in row; no siphon-storage term.
54T	TBR KISTERS/HyQuest TB7 200 mm 0.01 in / 0.254 mm	20.94	10.42	1256	126	41.88	20.94	6.98	0.254	pulse-output TBR	raw pulse; no siphon	314.2	0.254	—	New-generation non-syphoning TB7 row. KISTERS lists 200 mm catch diameter and 0.01 inch resolution; modeled as raw pulse because the public page identifies the type as non-syphoning.
56	TBR Davis 6466/6466M AeroCone / Rain Collector II 7852 214 cm² 0.01 in	21.17	10.48	1270.20	127.02	42.34	21.17	7.06	0.254	pulse-output TBR	raw pulse	214	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
57	TBR MeteoRain 200 Pro 0.254 mm / 0.01 in	21.24	10.49	1274.40	127.44	42.48	21.24	7.08	0.254	pulse-output TBR	raw pulse	200	0.254	—	Wired pulse output (B=0); no phase-code advantage. For short-window intensity, ranked by tip depth and collector area only.
58	TBR Onset HOBO RG3 15.39 cm 0.01 in	21.32	10.51	1279.20	127.92	42.64	21.32	7.11	0.254	pulse-output TBR	raw pulse	186	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
59	TBR Texas/Campbell TR-525 / TE525 6 in 0.01 in	21.34	10.52	1280.40	128.04	42.68	21.34	7.11	0.254	pulse-output TBR	raw pulse	182.4	0.254	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
60	TBR Casella TBRG 400 cm² 0.5 mm	40.89	20.43	2453.40	245.34	81.78	40.89	13.63	0.5	pulse-output TBR	raw pulse	400	0.5	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
61T	TBR EML / In-Situ ARG314 314 cm² 0.5 mm option	40.93	20.44	2455.58	245.56	81.85	40.93	13.64	0.5	pulse-output TBR	raw pulse	314	0.5	—	Optional coarse-resolution ARG314 configuration; included as a technical comparison because 0.5 mm tips are less suitable for short-window precision.
61T	TBR KISTERS/HyQuest TB6 0.5 mm	40.93	20.44	2455.57	245.56	81.85	40.93	13.64	0.5	Technical low-resolution TBR row	straight-through raw pulse; no siphon	314.2	0.5	—	TB6 coarse 0.5 mm option retained as a technical comparison row.
61T	TBR KISTERS/HyQuest TB7 200 mm 0.5 mm	40.93	20.44	2456	246	81.85	40.93	13.64	0.5	pulse-output TBR	raw pulse; no siphon	314.2	0.5	—	New-generation non-syphoning TB7 row. KISTERS lists 200 mm catch diameter and 0.5 mm resolution; modeled as raw pulse because the public page identifies the type as non-syphoning.
61T	TBR Rika / Honde / Renke / Tamaya 200 mm diameter 0.5 mm class	40.93	20.44	2455.58	245.56	81.85	40.93	13.64	0.5	pulse-output TBR	raw pulse	314.2	0.5	—	Grouped 200 mm diameter / 0.5 mm pulse-output class. The coarse tip depth dominates the analytical floor.
61T	WMO India Met Dept. TBRG Mk2 314 cm² 0.5 mm	40.93	20.44	2455.57	245.56	81.85	40.93	13.64	0.5	WMO historical technical TBR row	raw pulse	314.2	0.5	—	WMO historical 314 cm² / 0.5 mm technical row.
66T	TBR IMD / Astra-type 200 cm² TBRG 0.5 mm	41.08	20.48	2464.80	246.48	82.16	41.08	13.69	0.5	pulse-output TBR	raw pulse	200	0.5	—	IMD/AWS training source lists Astra TBRG collector diameter 159.6 mm, collector area 200 cm², 0.5 mm resolution, and 10 mL per tip. Modeled as raw pulse, no siphon.
66T	TBR MicroStep/Meteoservis MR2 200 cm² 0.5 mm option	41.08	20.48	2464.80	246.48	82.16	41.08	13.69	0.5	pulse-output TBR	raw pulse	200	0.5	—	Pulse-output tipping bucket (B=0); ranked by collector area and tip depth.
68T	TBR KISTERS/HyQuest TB6 1.0 mm	81.70	40.84	4902.02	490.20	163.40	81.70	27.23	1	Technical low-resolution TBR row	straight-through raw pulse; no siphon	314.2	1	—	TB6 coarse 1.0 mm option retained as a low-resolution technical comparison row.
68T	WMO Yokogawa Denshi Kiki WMB01 314 cm² 1.0 mm	81.70	40.84	4902.02	490.20	163.40	81.70	27.23	1	WMO historical technical TBR row	raw pulse	314.2	1	—	WMO historical 314 cm² / 1.0 mm low-resolution technical row.

Siphon-equipped tipping bucket gauges — 11 rows

Siphon-equipped tipping buckets carry the siphon-storage residual into short-window intensity uncertainty just as they do into accumulation uncertainty. The conservative γ_s = 1 assumption applies; a measured γ_s would shift these thresholds proportionally.

Table navigation: scroll left and right inside the table box to see all columns. The rank and gauge columns remain pinned; notes and technical evidence columns sit farther to the right.

In-class rank	Gauge / output product	P_min at 1% (mm)	P_min at 2% (mm)	1% @1 min (mm/h)	1% @10 min (mm/h)	1% @30 min (mm/h)	1% @1 h (mm/h)	1% @3 h (mm/h)	Δ_res (mm)	Evidence layer	State detail	A (cm²)	d / d_eq (mm)	V_s (mL)	Why it ranks here
1	Siphon KISTERS/HyQuest TB3/TB4/CS700 0.1 mm — siphon Vs=12 mL	17.73	8.83	1063.80	106.38	35.46	17.73	5.91	0.1	siphon TBR	raw pulse + siphon	628.3	0.1	12	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
2	Siphon Observator / RIMCO RIM-7499 siphon 0.2 mm	18.50	9.19	1109.86	110.99	37.00	18.50	6.17	0.2	siphon TBR	raw pulse + siphon	323.7	0.2	3.2	Siphon-controlled 203 mm tipping-bucket gauge. Siphon storage is estimated as half of the bucket volume for the configured tip depth and included with γs = 1 as a conservative unresolved storage term.
3	Siphon Observator / RIMCO RIM-7499 siphon 0.25 mm	23.01	11.46	1380.81	138.08	46.03	23.01	7.67	0.25	siphon TBR	raw pulse + siphon	323.7	0.2	4.0	Siphon-controlled 203 mm tipping-bucket gauge. Siphon storage is estimated as half of the bucket volume for the configured tip depth and included with γs = 1 as a conservative unresolved storage term.
4	Siphon Geolux RG400 0.1 mm — siphon Vs≈16 mL, 4 mL/tip	33.98	16.91	2038.80	203.88	67.96	33.98	11.33	0.1	siphon TBR	raw pulse + siphon	400	0.1	16	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
5	Siphon KISTERS/HyQuest TB3/TB4/CS700 0.2 mm — siphon Vs=12 mL	35.45	17.66	2127.00	212.70	70.90	35.45	11.82	0.2	siphon TBR	raw pulse + siphon	314.2	0.2	12	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
6	Siphon Hydrological Services TB-3 0.2 mm siphon — exact WMO row, s = 0.4 mm	36.77	18.32	2206.14	220.61	73.54	36.77	12.26	0.4472	WMO historical exact siphon TBR row	raw pulse + siphon	314.2	0.2	12.57 s=0.4 mm	TB-3 exact WMO/historical row uses the published siphon rainfall-depth term s = 0.4 mm.
7	Siphon Geolux RG200 0.2 mm — siphon Vs≈8 mL, 4 mL/tip	37.15	18.41	2229.00	222.90	74.30	37.15	12.38	0.2	siphon TBR	raw pulse + siphon	200	0.2	8	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
8	Siphon KISTERS/HyQuest TB3/TB4 / Campbell CS700/CS700H 0.01 in — siphon Vs=12 mL	37.65	18.78	2259.00	225.90	75.30	37.65	12.55	0.254	siphon TBR	raw pulse + siphon	314.2	0.254	12	Bucket plus integrated siphon storage; γ_s = 1 conservative siphon residual. The siphon term is part of the short-window boundary uncertainty.
9	Siphon Observator / RIMCO RIM-7499 siphon 0.5 mm	45.74	22.85	2744.35	274.43	91.48	45.74	15.25	0.5	siphon TBR	raw pulse + siphon	323.7	0.5	8.1	Siphon-controlled 203 mm tipping-bucket gauge. Siphon storage is estimated as half of the bucket volume for the configured tip depth and included with γs = 1 as a conservative unresolved storage term.
10	Siphon KISTERS/HyQuest TB3/TB4 0.5 mm siphon Vs=12 mL	51.47	25.71	3088.41	308.84	102.95	51.47	17.16	0.6292	Technical low-resolution siphon TBR row	raw pulse + siphon	314.2	0.5	12	Coarse TB3/TB4 0.5 mm siphon row with Vs = 12 mL retained for technical completeness.
11	Siphon KISTERS/HyQuest TB3/TB4 1.0 mm siphon Vs=12 mL	87.45	43.71	5247.16	524.72	174.91	87.45	29.15	1.07	Technical low-resolution siphon TBR row	raw pulse + siphon	314.2	1	12	Coarse TB3/TB4 1.0 mm siphon row with Vs = 12 mL retained for technical completeness.

Weighing, historical, and recording reference gauges — 7 rows

These rows show the amount-derived public envelope (10 mm at 1%) for reference. The Pluvio² S Intensity RT and rain[e] native 1-minute intensity products are separate output products with a different floor (±6 mm/h native) — they are NOT amount-derived and are not directly comparable to the depth-threshold values in this column. See "Where weighing fits for intensity" below.

Table navigation: scroll left and right inside the table box to see all columns. The rank and gauge columns remain pinned; notes and technical evidence columns sit farther to the right.

In-class rank	Gauge / output product	P_min at 1% (mm)	P_min at 2% (mm)	1% @1 min (mm/h)	1% @10 min (mm/h)	1% @30 min (mm/h)	1% @1 h (mm/h)	1% @3 h (mm/h)	Δ_res (mm)	Evidence layer	State detail	A (cm²)	d / d_eq (mm)	V_s (mL)	Why it ranks here
1T	Weighing Lambrecht rain[e] / rain[e]LP / rain[e]314 / rain[e]400 / rain[e]H3 public amount-total	10.00	5.00	600.00	60.00	20.00	10.00	3.33	—	weighing public envelope	public fixed floor	—	—	—	Weighing public envelope: ±0.1 mm or ±1% amount accuracy floor. The native real-time intensity product (Pluvio² S Intensity RT, rain[e] native 1-min) has a separate ±6 mm/h floor — see "Where weighing fits" below.
1T	Weighing OTT Pluvio² L Accu NRT / Accu total NRT	10.00	5.00	600.00	60.00	20.00	10.00	3.33	—	weighing public envelope	NRT amount product	—	—	—	Weighing public envelope: ±0.1 mm or ±1% amount accuracy floor. The native real-time intensity product (Pluvio² S Intensity RT, rain[e] native 1-min) has a separate ±6 mm/h floor — see "Where weighing fits" below.
1T	Weighing OTT Pluvio² S Accu NRT / Accu total NRT	10.00	5.00	600.00	60.00	20.00	10.00	3.33	—	weighing public envelope	NRT amount product	—	—	—	Weighing public envelope: ±0.1 mm or ±1% amount accuracy floor. The native real-time intensity product (Pluvio² S Intensity RT, rain[e] native 1-min) has a separate ±6 mm/h floor — see "Where weighing fits" below.
1T	Historical Theodor Friedrichs 7011/7013 Hellmann recording rain gauge	10.00	5.00	600.00	60.00	20.00	10.00	3.33	0.1	historical float/siphon recording reference	200 cm² Hellmann recorder; 0.1 mm chart resolution; 10 mm siphon reset	200	—	—	Historical chart-recording gauge with 200 cm² orifice and 0.1 mm chart resolution. Useful as a historical accumulation reference; not a modern electronic real-time intensity product.
N/R	Weighing Lambrecht rain[e]one Modbus public amount-total	—	5.00	—	—	—	—	—	—	weighing public envelope	public fixed floor	—	—	—	Weighing public envelope: ±0.1 mm or ±1% amount accuracy floor. The native real-time intensity product (Pluvio² S Intensity RT, rain[e] native 1-min) has a separate ±6 mm/h floor — see "Where weighing fits" below.
N/R	Weighing OTT Pluvio² L Intensity RT	—	—	—	—	—	—	—	—	weighing public envelope	RT 1-min intensity	—	—	—	Weighing public envelope: ±0.1 mm or ±1% amount accuracy floor. The native real-time intensity product (Pluvio² S Intensity RT, rain[e] native 1-min) has a separate ±6 mm/h floor — see "Where weighing fits" below.
N/R	Weighing OTT Pluvio² S Intensity RT	—	—	—	—	—	—	—	—	weighing public envelope	RT 1-min intensity	—	—	—	Weighing public envelope: ±0.1 mm or ±1% amount accuracy floor. The native real-time intensity product (Pluvio² S Intensity RT, rain[e] native 1-min) has a separate ±6 mm/h floor — see "Where weighing fits" below.

Lambrecht rain[e] hi-resolution state-model layers — 6 rows

These rows are mathematical state-resolution model potential layers — what the analytical floor would predict if the advertised 0.001 mm scale-state or 0.01 mm pulse-state could be lifted to a real-time intensity product. They sit above all validated intensity rows in the model. They require measured weighing time constant, filter bandwidth, and self-emptying-correction interval before they can be treated as defensible real-time intensity claims. The defensible Lambrecht row at this horizon is the public envelope above (10 mm at 1% amount-derived; or ±6 mm/h native intensity floor — see "Where weighing fits").

Table navigation: scroll left and right inside the table box to see all columns. The rank and gauge columns remain pinned; notes and technical evidence columns sit farther to the right.

In-class rank	Gauge / output product	P_min at 1% (mm)	P_min at 2% (mm)	1% @1 min (mm/h)	1% @10 min (mm/h)	1% @30 min (mm/h)	1% @1 h (mm/h)	1% @3 h (mm/h)	Δ_res (mm)	Evidence layer	State detail	A (cm²)	d / d_eq (mm)	V_s (mL)	Why it ranks here
1	Model only Lambrecht rain[e]400 — 0.001 mm hi-res scale-state model	0.635	0.166	38.13	3.81	1.27	0.635	0.212	0.001	rain[e] hi-res state model	scale state: ≈6.64 bits	400	0.1	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
2	Model only Lambrecht rain[e]314 — 0.001 mm hi-res scale-state model	0.804	0.207	48.27	4.83	1.61	0.804	0.268	0.001	rain[e] hi-res state model	scale state: ≈6.99 bits	314	0.1274	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
3	Model only Lambrecht rain[e]400 — 0.01 mm hi-res pulse-state model	1.19	0.494	71.22	7.12	2.37	1.19	0.396	0.01	rain[e] hi-res state model	pulse state: ≈3.32 bits	400	0.1	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
4	Model only Lambrecht rain[e] / rain[e]LP / rain[e]H3 — 0.001 mm hi-res scale-state model	1.25	0.318	75.30	7.53	2.51	1.25	0.418	0.001	rain[e] hi-res state model	scale state: ≈7.64 bits	200	0.2	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
5	Model only Lambrecht rain[e]314 — 0.01 mm hi-res pulse-state model	1.31	0.52	78.36	7.84	2.61	1.31	0.435	0.01	rain[e] hi-res state model	pulse state: ≈3.67 bits	314	0.1274	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.
6	Model only Lambrecht rain[e] / rain[e]LP / rain[e]H3 — 0.01 mm hi-res pulse-state model	1.65	0.593	99.18	9.92	3.31	1.65	0.551	0.01	rain[e] hi-res state model	pulse state: ≈4.32 bits	200	0.2	—	Hi-resolution state-resolution model layer. Mathematical potential only; requires measured weighing response time, filter bandwidth, and self-emptying-correction interval before being treated as a real-time intensity claim.

Why MeteoRain IoT³ is dramatically ahead of the wired version in this ranking

For short-window intensity, the IoT³ phase code resolves the boundary residual at both ends of the reporting window to 1/8 of a tip rather than the full tip depth. The variance reduction is (1/8)² = 1/64 per boundary, equivalent to a roughly 64× lower boundary variance for a fully bracketed interior interval. In practical depth-threshold terms, this means the MeteoRain IoT³ 533 Classic at the 1% target needs ≈1.0 mm of rainfall to reach 1% short-window intensity uncertainty, vs ≈6.4 mm for the wired equivalent of the same hardware — a factor of about 6× improvement. The accumulation ranking shows the opposite picture: for daily totals where the event start and end are not bracketed by tips, the IoT³ and wired versions tie.

Where weighing fits for intensity

Dynamic response of weighing gauges

WMO laboratory and field intercomparison work supports the main caution used in this article: weighing gauges can be accurate under constant-flow laboratory conditions after stabilization, yet their 1-minute rainfall-intensity performance depends on acquisition-system response time and internal filtering. WMO reported significant delays in the sensing of rain-intensity time variation by weighing gauges and found that only one instrument met the WMO 1-minute rainfall-intensity requirement.

The WMO/JMA summary of the laboratory intercomparison describes the step-response test for weighing gauges: flow was switched from 0 to 200 mm/h and back to 0, then the output was observed until it stabilized, with possible delay evaluated at better than 1-minute resolution. Therefore, a weighing gauge is not ranked from digital resolution alone. It is ranked for dynamic intensity only when the public documentation identifies the output product, sampling interval, output delay, filtering behavior, and response to changing rainfall.

The OTT Pluvio² S Intensity RT and Lambrecht rain[e] native 1-minute intensity products have a different floor than the amount-derived rows in the table above. Their published 1-minute intensity floor is ±6 mm/h (or ±1%, whichever is larger), which translates to a 1-minute intensity threshold of 600 mm/h at 1%, 300 mm/h at 2%, and 200 mm/h at 3%. These are not depth thresholds — they are floors on the 1-minute moving-sum intensity output of the weighing instrument, dominated by the load-cell noise filtering and dynamic response, not by an inter-tip stochastic floor.

For sub-hourly intensity at low-to-moderate rain rates, the transmitted bracketed-state TBR (MeteoRain IoT³ B3/B3) sits at a depth threshold of 1.0–2.8 mm at 1%, equivalent to 60–166 mm/h at the 1-minute horizon. That is roughly an order of magnitude below the published 600 mm/h native weighing-intensity floor. Native real-time weighing intensity and bracketed-state TBR intensity are different output products with different physics; comparing them on equal evidence basis requires the response-gating discussion in the Lambrecht hi-res row sub-section above.

Unranked weighing and filtered-weighing reference products

Unranked weighing references. These products are legitimate precipitation instruments, but their public documentation does not provide a full dynamic response model for transparent 1-minute or 10-minute intensity ranking. The same products are listed as N/R rows at the bottom of the Overall ranking table. For accumulation totals, some may be useful operational gauges, but the public datasheets do not provide enough information to convert static resolution or static weight accuracy into a transparent required-depth ranking for changing rainfall.

Instrument	What is published	Why it is not a transparent short-window intensity rank	How it is treated here
MPS / MicroStep-MIS TRwS	Weighing precipitation gauge family with 0.001 mm resolution and headline intensity information.	No public time constant, filter kernel, raw/filtered weighing noise, output delay, or residual compensation error sufficient for a transparent 1-minute or 10-minute dynamic ranking.	Static / filtered weighing reference only; not ranked for short-window intensity.
Apogee Cloudburst SG-400 series	Weighing precipitation gauge with load cell, SDI-12 output, 0.01 mm resolution, cumulative amount accuracy of 0.1 mm below 5 mm and 1% above 5 mm, and rate/intensity accuracy of 5% above 2 mm/h. The documents describe filtering for evaporation, vibration, and temperature.	The public documents do not publish the dynamic response model needed to verify how the filtered weighing signal responds to changing rainfall intensity.	Static weighing-total / public-envelope reference; not ranked as a short-window dynamic intensity gauge.
Geonor T-200B	Historical vibrating-wire weighing precipitation gauge with WMO history, 200 cm² inlet, and sensitivity better than 0.1 mm.	The manual supports total precipitation and rate reporting through the data-acquisition system, but it does not provide a public dynamic time constant/filter/noise model for a reproducible short-window intensity floor.	Historical weighing reference; not ranked as a transparent short-window intensity gauge.
FTS/AEM SDI-RAINE-HYDRO	Self-emptying weighing/hybrid product with public amount and intensity envelopes.	No public filter kernel, raw/filtered noise, output-delay model, or step/ramp response sufficient for transparent dynamic ranking.	Weighing/self-emptying precipitation reference; not a stronger dynamic rank.
FTS/AEM AWP all-weather precipitation gauge	All-weather weighing precipitation gauge family with one-minute intensity, total precipitation, rain duration, and filtering/compensation claims.	No full public dynamic model converting static resolution or filtering into a transparent changing-rain measurement floor.	Static/filtered weighing reference only.
Meteoservis MRW500	WMO reference weighing gauge; public materials list 500 cm² collecting area and 0.1 mm pulse simulation.	Exact public time constant/filter/noise model was not extracted from final WMO tables.	Historical WMO reference; not a modern transparent dynamic ranking row.
WMO weighing references: VRG101, older OTT Pluvio / Pluvio 250, PG200, MPA-1M	Historical WMO laboratory/field reference weighing instruments.	Instrument-specific response, filter, and processing details are not represented by a single public row in this article.	Reference-only WMO validation context.
SIAP+MICROS TPW / TPWE weighing rain and snow gauges	TPW/TPWE portfolio lists 200/314/400 cm² weighing gauges, 0.001 mm resolution, 120 mm/min maximum rain intensity, pulse/RS485/SDI-12 outputs, vibration/dust/temperature compensation processing, and TPWE self-emptying behavior.	No public time constant, filter kernel, raw/filtered weighing noise, output delay, residual compensation error, or step/ramp response sufficient for transparent 1-minute or 10-minute dynamic ranking.	Static / filtered weighing reference only; not ranked for short-window intensity.

If Apogee's published 5% rate/intensity value were treated as a fully validated dynamic fixed floor, it would not support a 3% intensity ranking. If MPS's published 0.025 mm/min value were accepted as a dynamic fixed floor, it would imply 1.5 mm/h and a 3% threshold of 50 mm/h. Neither value is used in the ranked intensity table because accepting headline values without a response-time, filtering, delay, and noise model would create a non-auditable comparison against instruments with more transparent product definitions.

Radar precipitation sensors, smart disdrometers, and other non-catchment rain indicators

Radar precipitation sensors and smart disdrometers are not ranked as catchment rain gauges in this analysis. These sensors do not collect water in a calibrated bucket, funnel, or weighing container. They infer precipitation from radar return strength, Doppler velocity, drop-size classes, and precipitation-type algorithms. This makes them useful for low-maintenance present-weather detection, precipitation-type classification, and dense sensor networks, but it also means their rainfall amount is an algorithmic retrieval rather than a direct catchment measurement.

Laboratory accuracy is not field accuracy. The OTT/Lufft WS100 lists liquid precipitation accuracy under laboratory conditions using a reference-drop simulator with a 2.8 mm drop diameter. The Vaisala PRECICAP RM60 lists 2% precipitation accuracy in laboratory conditions. Natural rain is not a single reference drop; practical drop-count examples for 200 cm², 400 cm², and 533 cm² catchment areas show why real rain must be treated as a changing drop-size distribution. It is a changing mixture of drop sizes, fall speeds, wind effects, turbulence, evaporation below the sensing volume, and sometimes mixed precipitation; drop volume and shape can also be checked with the raindrop shape and size calculator. A radar or disdrometer algorithm must prove its accuracy across those conditions before its laboratory number can be used as a rain-gauge ranking value.

Weather-radar QPE provides the cautionary context. Radar does not directly measure rainfall amount; it measures returned electromagnetic energy and converts it to rain rate through assumptions about drop-size distribution and fall speed. NWS explains that different drop-size distributions can produce the same reflectivity but different rain rates, and that radar rain-rate estimates can vary from true rain rate by a typical factor of two. X-band radar studies similarly show that radar rainfall usually requires gauge adjustment and that short-window, high-resolution radar rainfall uncertainty is often tens of percent or larger.

A radar precipitation sensor is not a rain gauge unless its algorithmic rainfall amount has been field-validated against catchment references over natural drop-size distributions and wind conditions. A laboratory 2% or 10% number should not be used as a field rain-intensity ranking unless the manufacturer publishes the test distribution, wind conditions, retrieval-algorithm limits, measurement volume, and field validation against traceable catchment gauges.

Practical reading: WS100, RM60, WXT-style impact sensors, optical disdrometers, and similar non-catchment precipitation sensors are treated here as reference-only sensors, not ranked rain gauges. They may be valuable for precipitation type, event detection, maintenance-light networks, and radar-network support. They are not assigned a transparent 1-minute, 10-minute, or accumulation accuracy floor unless the manufacturer publishes field-valid dynamic accuracy across natural drop-size distributions, wind speeds, wind directions, mixed precipitation, and changing rain intensity.

Rain sensors / indicators — not ranked as transparent catchment gauges

Caution: the products below can be useful rain indicators, precipitation classifiers, present-weather sensors, radar-network support sensors, or maintenance-light network sensors. From public datasheets alone, they are not reliable transparent determinations of true rain rate or accumulation in the same way as calibrated catchment gauges. Their rainfall amount depends on laboratory algorithms, retrieval assumptions, field conditions, and validation data that are not equivalent to bucket depth, collector area, siphon volume, or a weighed catchment mass.

Sensor class / example	Principle	Public accuracy basis	Main uncertainty issue	Ranking treatment here
OTT / Lufft WS100 radar precipitation sensor / smart disdrometer	24 GHz Doppler radar; reports precipitation type, quantity, intensity, drop-size classes, and particle velocity.	Liquid precipitation accuracy is stated as ±0.16 mm or ±10% of measured value under laboratory conditions using a Lufft reference-drop simulator with 2.8 mm drops and 10–200 mm/h adjustable intensity.	Natural rain is a mixed drop-size distribution, not a single 2.8 mm reference-drop condition. Wind, turbulence, mixed precipitation, and algorithm limits determine field performance.	Reference-only non-catchment sensor. Not ranked against catchment rain gauges from the datasheet alone.
Vaisala PRECICAP® RM60 radar precipitation sensor	61 GHz near-field Doppler radar; reports accumulation, intensity, precipitation type, drop-size distribution, and reflectivity factor.	Datasheet lists 2% precipitation accuracy in laboratory conditions and 22 drop-size classes.	Promising low-maintenance radar sensor, but the public ranking model needs field-valid error across natural DSD, wind, mixed precipitation, retrieval limits, and changing intensity.	Reference-only non-catchment sensor. Not ranked as a transparent rain-gauge accuracy floor without field-validation details.
Vaisala WXT520 / WXT530 / WXT536 class	Non-catchment impact/acoustic precipitation sensing.	Older WXT documentation excludes possible wind-induced error; newer WXT-style specifications describe rainfall accuracy as weather-dependent.	Useful caution example: non-catchment sensors can have large instrument-specific wind and geometry errors that are not captured by a laboratory accuracy line.	Reference-only rain indicator / compact weather-transmitter precipitation channel, not a catchment rain-gauge ranking row.
Optical disdrometers and present-weather sensors	Optical beam interruption, fall-speed classes, hydrometeor classification, and retrieval algorithms.	Manufacturer-specific laboratory or controlled-test statements.	Alignment, splash, wind, DSD, mixed precipitation, classification thresholds, and algorithm assumptions determine field rain-rate accuracy.	Reference-only unless field-corrected and validated against catchment references for the intended site and window length.
Weather radar / X-band radar QPE	Radar reflectivity converted to rain rate over an air volume and then adjusted or merged with gauges.	Operational QPE is generally gauge-adjusted; uncertainty is not a point rain-gauge floor.	Reflectivity-to-rain-rate conversion is not unique because DSD changes; attenuation, beam geometry, vertical profile, and calibration add additional uncertainty.	Valuable spatial rainfall product, not a point catchment-gauge substitute for this ranking table.
Nanoenvi MET radar rain sensor	Radar-based non-catchment precipitation sensing; public materials emphasize radar rain sensing and 0–200 mm/h intensity capability.	Algorithmic radar precipitation indicator, not a calibrated catchment volume.	Use as a compact precipitation indicator/classifier. Validate against catchment references before using as a rain gauge.	Reference-only non-catchment sensor; not ranked.
WeatherFlow Tempest haptic rain sensor	Haptic/impact non-catchment precipitation sensing on a sensor surface.	WeatherFlow support documentation describes limitations and troubleshooting for rain accumulation.	Useful for compact consumer weather stations and event indication. Not a substitute for a traceable catchment rain gauge.	Reference-only impact/haptic indicator; not ranked.
Stratus RG202 / CoCoRaHS-style manual rain gauge	Manual catchment gauge for observer-read totals.	Manual reading is suitable for daily/event accumulation references, not automatic short-window intensity.	Use as a manual accumulation reference and observer-standard context.	Manual reference only; not ranked as automatic intensity product.
WMO historical non-catchment / alternative instruments	Alluvion, Serosi/Nilometre, KNMI electrical rain gauge, PWD22, Parsivel, Thies LPM, WXT510, LCR-PVK ATTEX/DROP.	Laboratory/field intercomparison context; principles include optical, radar, impact, pressure, conductivity, or water-level methods.	Useful for WMO validation history and comparison context.	Reference-only / historical validation context; not ranked as catchment gauges.

Sources: OTT/Lufft WS100 technical data; Vaisala RM60 datasheet; NWS radar-rainfall estimate explanation; X-band radar rainfall adjustment study; Vaisala WXT520 user guide.

Drop-size-distribution background: natural rain is a mixture of drop sizes, not a monodisperse stream. See the practical drop-count references for 200 cm², 400 cm², 533 cm², 8 inch / 325 cm², 10 inch / 500 cm², 800 cm², and 1000 cm² gauge areas.

WMO validation layer for historical and exact-model rows

The deterministic analytical floor remains the main ranking metric. WMO 1-minute rainfall-intensity resolution and declared/measured rainfall-intensity range are added as a validation layer so that strong mathematical rows are not over-interpreted outside their tested operating range.

Validation item	How it is used here
WMO 1-minute RI resolution	Flags whether a gauge can report rainfall intensity with enough resolution for 1-minute products.
Declared or WMO-tested RI range	Flags rows where the 1-minute equivalent of a 1% target would be outside the tested or declared intensity range.
Correction class	Labels no correction, pulse correction, software correction, mechanical correction, siphon flow control, or weighing/filtering.
Ranking treatment	Separates main-ranked rows from alias-only rows, reference-only non-catchment rows, and unranked weighing references.

Manufacturer envelope validity bands

The analytical-floor ranking in the main tables above assumes each gauge is operating within its published manufacturer envelope. Different rate bands have different published accuracy specifications, and above the published band the analytical floor is no longer the dominant uncertainty term. The matrix below summarizes the typical envelope behavior by row category. For a specific application, always check the candidate gauge's published datasheet for the exact rate-band specification.

Row category	Low rate (0–100 mm/h)	Moderate (100–250 mm/h)	High (250–500 mm/h)	Extreme (>500 mm/h)	Failure mode above design rate
TBR Raw-pulse 0.1 mm tipping bucket	Spec'd ±1–2% per datasheet	Dynamic loss begins; vendor-specific corrections may apply	Significant dynamic loss (5–15%+ undercounting); above published envelope for most products	Out of spec; uncorrected output unreliable	Bucket cannot tip fast enough between fills; some water arrives during the tip and is lost
TBR Raw-pulse 0.2–0.5 mm tipping bucket	Spec'd ±2–3% per datasheet	Same dynamic loss onset as 0.1 mm	Out of spec for most products	Out of spec	Same as above; coarser bucket has slightly higher tip rate before loss
IoT³ Phase-aware tipping bucket (B=3)	Spec'd ±1% (Barani field-performance statement)	Phase code preserves boundary accuracy; per-tip dynamic loss begins as in raw-pulse equivalent	Dynamic loss as in raw-pulse same hardware; phase code does not mitigate dynamic loss	Out of spec for the tip mechanism, regardless of phase code	The 3-bit phase code corrects boundary uncertainty, not mechanical tip rate. Underlying tip mechanism is the same as the wired version.
Siphon Siphon-equipped tipping bucket	Spec'd ±2%	Spec'd ±2% (designed band, e.g. KISTERS TB4)	Spec'd ±3% to 500 mm/h (KISTERS TB4); other siphon TBRs vendor-specific	Above published envelope; siphon overflow possible	Siphon buffers flow into bucket; designed to extend valid rate band well beyond raw-pulse TBRs
Weighing Public envelope, amount-derived (Pluvio² Accu NRT, rain[e] amount)	±0.1 mm or ±1% amount, rate-independent	Same; rate-independent	Same; rate-independent	Same; bounded by load-cell capacity (typically 1500–3000 mm depth)	Amount-derived product is intrinsically rate-independent; failure mode is load-cell saturation at extreme cumulative depth, not at high instantaneous rate
Weighing Native real-time 1-min intensity (Pluvio² Intensity RT, rain[e] native 1-min)	±6 mm/h or ±1% within published linear range	Same; 1-min moving sum filters short bursts	Response lag becomes visible; published envelope still ±1%; lag relative to true rate increases	Above published intensity range; lag and saturation dominate	60-second moving-sum filtering smears short high-rate bursts; load-cell dynamic response and self-emptying timing matter
Model only Lambrecht hi-resolution state-model layer	Mathematical model potential only — not validated at any rate without measured weighing response time, filter bandwidth, dead-time, and self-emptying-correction interval. Defensible row at this horizon is the public envelope above (10 mm at 1% amount, or ±6 mm/h native intensity).				Validation gap, not rate-dependent failure

Behavior at high intensity (above the published envelope)

The analytical-floor model used in the rankings above assumes each gauge is operating within its published envelope. Above the envelope, mechanical and dynamic effects start to dominate and the ranking framework breaks down. This is most relevant for short-window intensity readings during heavy rain — flash-flood warnings, urban-drainage runoff at peak intensity, and convective cells with rates above several hundred mm/h.

Tipping-bucket dynamic loss

Above approximately 100 mm/h, raw-pulse tipping buckets begin to lose tips because the bucket cannot tip and refill fast enough between fills. Some water that arrives during the tip motion is lost or counted incorrectly. The classical references are Calder & Kidd (1978), Marsalek (1981), and Niemczynowicz (1986), with later refinements by Habib, Krajewski & Kruger (2001). The reported uncorrected undercount is typically 5–15% at 100–200 mm/h and grows roughly with rate; at 500 mm/h, raw-pulse tipping buckets without dynamic correction can underestimate by 20–40%.

This dynamic loss is not captured by the analytical-floor model in this article. The floor assumes that every drop arriving in the reporting window is counted exactly once with σ_tip variance per tip. Above the dynamic-loss onset, that assumption is violated and the actual short-window error is larger than the analytical floor predicts. Vendors that publish dynamic-correction curves (or built-in firmware corrections) extend the usable rate band; they do not change the analytical-floor floor.

Why siphon TBRs exist

Siphon-equipped tipping buckets — KISTERS / HyQuest TB4, Geolux RG200/RG400, the Campbell CS700 family — buffer the incoming water flow upstream of the bucket. This decouples the bucket tip rate from the incoming rate, which is exactly what mitigates the dynamic-loss onset. The KISTERS TB4 datasheet states ±2% from 0–250 mm/h and ±3% from 250–500 mm/h, a band that raw-pulse TBRs cannot match. The trade-off is the siphon-storage residual term γ_s discussed in the main rankings: at low and moderate rates the siphon adds an unresolved boundary-state term that places siphon TBRs near the bottom of the analytical-floor accumulation ranking. At high rates, the same siphon design extends the usable rate band substantially. Siphon TBRs are not "worse" gauges — they are designed for a different rate band than the analytical-floor ranking foregrounds.

Weighing-gauge dynamic response

Weighing gauges measure mass rather than counting discrete tips, so they do not exhibit tip-rate-limited dynamic loss. Their high-intensity failure mode is different: load-cell dynamic response time, multi-stage filtering for wind and shock rejection, and self-emptying timing all add lag between the true rainfall rate and the reported short-window intensity. The Lambrecht rain[e] family explicitly publishes "6 measurements per minute" feeding a 60-second trailing moving sum; the OTT Pluvio² Intensity RT product is also a filtered 1-minute output. At high rates of change, the reported 1-minute intensity lags the true rate by approximately the filter response time. The analytical floor (±6 mm/h or ±1% native) describes the noise floor of the filtered output, not its lag.

Practical implication

For application contexts at sustained high rates (flash-flood warning, convective cell tracking, tropical cyclone observations), three considerations override the headline intensity-floor ranking shown in the main table above:

• Check the manufacturer envelope. Use the validity-band matrix above to confirm the candidate gauge is spec'd in the rate band you need. Out-of-band operation invalidates both the published envelope and the analytical floor.
• Prefer siphon TBRs or weighing-amount products at high rates. Raw-pulse TBRs (including the bracketed-state IoT³ family for short-window intensity) remain accurate at low-to-moderate rates and can lose tips at high rates. The siphon design directly mitigates this; weighing-amount products (Pluvio² Accu NRT, rain[e] amount-derived) are fundamentally rate-resilient up to load-cell saturation.
• For real-time short-window intensity at high rates, accept the trade-off. No gauge in this comparison set provides simultaneously: (i) the analytical-floor headline accuracy of phase-aware short-window intensity, (ii) freedom from tip-rate dynamic loss, and (iii) zero filtering lag. Application contexts must pick which two of the three to optimize.

References for tipping-bucket dynamic-loss correction

• Calder, I.R., and Kidd, C.H.R., 1978. A note on the dynamic calibration of tipping-bucket gauges. Journal of Hydrology, 39(3–4), 383–386. doi:10.1016/0022-1694(78)90013-6
• Marsalek, J., 1981. Calibration of the tipping-bucket raingage. Journal of Hydrology, 53(3–4), 343–354. doi:10.1016/0022-1694(81)90010-X
• Niemczynowicz, J., 1986. The dynamic calibration of tipping-bucket raingauges. Nordic Hydrology, 17(3), 203–214.
• Habib, E., Krajewski, W. F., and Kruger, A., 2001. Sampling errors of tipping-bucket rain gauge measurements. Journal of Hydrologic Engineering, 6(2), 159–166. doi:10.1061/(ASCE)1084-0699(2001)6:2(159)
• Vuerich, E., Monesi, C., Lanza, L. G., Stagi, L., and Lanzinger, E., 2009. WMO Field Intercomparison of Rainfall Intensity Gauges (Vigna di Valle, Italy). WMO IOM Report No. 99, WMO/TD-No. 1504.

Siphon TBR storage state is conservatively modelled

Siphon-equipped tipping buckets carry the siphon-storage residual into short-window intensity uncertainty just as they do into accumulation uncertainty (γ_s = 1 conservative residual fraction). Sensitivity reference: at γ_s = 0.5 the KISTERS TB4 0.1 mm 1% threshold falls from 17.7 mm to 11.3 mm; at γ_s = 0 it falls to 8.2 mm. See sample calculation 3 in the appendix.

Reference: Lambrecht 1-minute intensity timing in plain language

For readers who want to understand why the public Lambrecht envelope (or the ±6 mm/h native intensity floor), rather than the hi-resolution state model, is the defensible row at this horizon:

Publicly defined item	Plain-language meaning	Why it matters here
6 measurements per minute	The 1-minute intensity is built from six 10-second measurement steps.	The native 1-minute intensity product behaves like a 60-second trailing moving sum, not like an instantaneous inter-tip measurement.
Moving sum of the last 6 values	Each new value is combined with the previous five values to form "intensity within the last minute."	A new rainfall step appears gradually during the first minute and then exits the product after it is older than 60 seconds.
Self-emptying by tipping	When one chamber is full, the vessel tips and weighing continues in the other chamber.	The tip should not erase rainfall from the total amount. It creates a correction event that must be timed and filtered correctly.
Multi-stage filtering	Wind, shock, and vibration are filtered before the weight increase is evaluated.	Filtering reduces noise and can also delay or smear short-window intensity changes.
Variance over 4 s	The instrument can output a short-term variance/quality value.	This acknowledges noise. It is not the same as a published numerical load-cell noise specification.

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Appendix — methodology, sample calculations, and source data

This appendix gives the full mathematical model, a worked sample calculation for each row category in the comparison set, two visualizations of the full ranking, and a list of source documents. Any reader can reproduce every number in the article above using the formulas and inputs below.

A1. Methodology in plain language

The equations below generalize the same resolution-and-depth logic shown in the simpler Rain Gauge Accuracy Tables and the rain-intensity error guide.

The model decomposes the total uncertainty at a reporting interval into two independent parts: a per-tip stochastic floor (random variation in the volume of water needed to tip the bucket, or equivalent state-resolution variation for a weighing product) and a boundary-state residual (unresolved water at the start and end of the reporting interval). The two parts add as variances. Expanded uncertainty uses the GUM convention U95 = 2σ_total. The minimum rainfall depth needed to reach a target relative uncertainty q is the positive root of a quadratic equation derived from U95(P)/P = q.

σ_tip = 0.05 / (0.1 · A) (per-tip stochastic floor; A = collector area in cm²)

σ_B² = (Δ_start² + Δ_end²) / 12 (boundary residual variance, uniform-distribution assumption)

σ_total²(P) = σ_B² + (P/d) · σ_tip² (total variance at reporting interval depth P)

U95(P) = 2 · σ_total(P) (expanded uncertainty, GUM coverage factor k = 2)

P_min = [4σ_tip²/d + √( (4σ_tip²/d)² + 16 q² σ_B² )] / (2 q²) (solve U95(P_min)/P_min = q)

For ordinary tipping buckets transmitting only pulses (B = 0), Δ_start = Δ_end = d (the tip depth). For a phase-aware tipping bucket transmitting a B-bit phase code with both window boundaries inside an active rain event (the "B3/B3 interior" case used in this intensity ranking for the MeteoRain IoT³ family), Δ = d / 2^B = d/8 for B = 3. For siphon-equipped TBRs, the effective boundary variance is increased by the siphon-storage residual: σ_B² = (d² + γ_s² · s²) / 6 where s = 10 · V_s / A is the depth-equivalent siphon storage and γ_s ∈ [0, 1] is the unresolved-residual fraction (γ_s = 1 conservative). For weighing public envelope amount-derived rows, U_amount = max(0.1 mm, 0.01 · P) → P_min = 10 mm at 1%. For native 1-minute weighing intensity rows, U_I = max(6 mm/h, 0.01 · I) → I_min = 600 mm/h at 1%. For Lambrecht hi-resolution state-model rows, Δ is set to the advertised state resolution (0.001 mm or 0.01 mm), not the tip depth.

A2. Worked sample calculations — one per row category

Calculation 1 — Raw-pulse tipping bucket (Lambrecht 15189 0.2 mm, 200 cm²)

Inputs: A = 200 cm², d = 0.2 mm, B = 0 (no phase code transmitted)

σ_tip: 0.05 / (0.1 · 200) = 0.05 / 20 = 0.0025 mm

σ_B²: Δ_start = Δ_end = d = 0.2 mm → σ_B² = 2(0.2²)/12 = 0.08/12 = 0.006667 mm²

Quadratic at q = 0.01: q² = 1×10⁻⁴; 4σ_tip²/d = 4(0.0025²)/0.2 = 1.25×10⁻⁴; 4σ_B² = 0.02667

Discriminant: (1.25×10⁻⁴)² + 4(1×10⁻⁴)(0.02667) = 1.069×10⁻⁵; √ = 3.270×10⁻³

P_min: (1.25×10⁻⁴ + 3.270×10⁻³) / (2 × 1×10⁻⁴) = 3.395×10⁻³ / 2×10⁻⁴

P_min(1%) = 16.97 mm — same value as in the accumulation ranking, because raw-pulse TBRs (B = 0) have no phase-code advantage; intensity and accumulation share the same floor on the same hardware.

Calculation 2 — IoT³ phase-aware TBR (MeteoRain IoT³ 400 Aero, B3/B3 short-window — the case for this ranking)

Inputs: A = 400 cm², d = 0.1 mm, B = 3 (3-bit phase code), both boundaries bracketed by tips (interior of active rain event)

σ_tip: 0.05 / (0.1 · 400) = 0.05 / 40 = 0.00125 mm

σ_B² (B3/B3 interior): Δ = d / 2³ = 0.1/8 = 0.0125 mm; σ_B² = 2(0.0125²)/12 = d²/384 = 0.01/384 = 2.604×10⁻⁵ mm²

Quadratic at q = 0.01: 4σ_tip²/d = 4(0.00125²)/0.1 = 6.25×10⁻⁵; 4σ_B² = 1.042×10⁻⁴

Discriminant: (6.25×10⁻⁵)² + 4(1×10⁻⁴)(1.042×10⁻⁴) = 4.56×10⁻⁸; √ = 2.135×10⁻⁴

P_min: (6.25×10⁻⁵ + 2.135×10⁻⁴) / 2×10⁻⁴ = 2.760×10⁻⁴ / 2×10⁻⁴

P_min(1%, B3/B3 short-window intensity) = 1.380 mm — applies only to ongoing intensity windows interior to active rain. For daily/event totals (B0/B0 case), repeat with σ_B² = d²/6 = 1.667×10⁻³ mm² → P_min(1%, B0/B0 daily) = 8.483 mm, identical to wired MeteoRain 400 Aero. Equivalent intensity at 1-minute window: 1.380 × 60 = 82.8 mm/h.

Calculation 3 — Siphon TBR (KISTERS / HyQuest TB4 0.1 mm, V_s = 12 mL)

Inputs: A = 628.3 cm², d = 0.1 mm, V_s = 12 mL, γ_s = 1 (conservative)

σ_tip: 0.05 / (0.1 · 628.3) = 7.957×10⁻⁴ mm

Depth-equivalent siphon storage: s = 10 · V_s / A = 10 · 12 / 628.3 = 0.191 mm

σ_B² (bucket + siphon): (d² + γ_s² · s²) / 6 = (0.01 + 1·0.0365) / 6 = 0.007746 mm²

Quadratic at q = 0.01: 4σ_tip²/d = 2.532×10⁻⁵; 4σ_B² = 0.03098

Discriminant: 1.239×10⁻⁵; √ = 3.521×10⁻³

P_min: (2.532×10⁻⁵ + 3.521×10⁻³) / 2×10⁻⁴

P_min(1%, γ_s = 1) = 17.73 mm. At γ_s = 0.5: 11.3 mm. At γ_s = 0: 8.16 mm. Same value used for both intensity and accumulation rankings (the siphon term carries through). Equivalent intensity at 1 min: 17.73 × 60 = 1064 mm/h.

Calculation 4 — Weighing native real-time 1-minute intensity (OTT Pluvio² S Intensity RT)

Inputs: Public manufacturer envelope U_I = max(0.1 mm/min, 0.01 · I) = max(6 mm/h, 0.01 · I)

Solve U_I / I ≤ q at q = 0.01: max(6/I, 0.01) ≤ 0.01 → 6/I ≤ 0.01 → I ≥ 600 mm/h

I_min(1%, native 1-min intensity) = 600 mm/h. At q = 0.02: 300 mm/h. At q = 0.03: 200 mm/h. The native real-time intensity output uses the manufacturer specification directly; it is dominated by load-cell noise filtering and dynamic response, not by an inter-tip stochastic floor. For comparison, the amount-derived row (OTT Pluvio² S Accu NRT amount) gives 10 mm at 1%, equivalent to 600 mm/h at 1 minute (60 × 10 mm) — coincidentally the same value at the 1-minute horizon. This occurs because the amount-derived ratio happens to align with the native intensity ratio at this specific horizon.

Calculation 5 — Lambrecht hi-resolution scale-state model layer (rain[e]400, Δ_res = 0.001 mm, model only)

Inputs: A = 400 cm², d_eq = 0.1 mm, Δ_res = 0.001 mm (advertised scale resolution treated as effective state resolution in the model)

σ_tip: 0.05 / (0.1 · 400) = 0.00125 mm (same as MeteoRain IoT³ 400 Aero, because A is the same)

σ_B²: 2(Δ_res)²/12 = (0.001)²/6 = 1.667×10⁻⁷ mm²

Quadratic at q = 0.01: 4σ_tip²/d = 6.25×10⁻⁵; 4σ_B² = 6.667×10⁻⁷

Discriminant: (6.25×10⁻⁵)² + 4(1×10⁻⁴)(6.667×10⁻⁷) = 4.173×10⁻⁹; √ = 6.460×10⁻⁵

P_min: (6.25×10⁻⁵ + 6.460×10⁻⁵) / 2×10⁻⁴

P_min(1%, model layer) = 0.6355 mm — equivalent to 38.1 mm/h at 1-minute window. Caveat: this assumes the advertised 0.001 mm scale resolution can be lifted to a defensible real-time intensity product. In practice this requires a measured weighing time constant, filter bandwidth, dead-time, and self-emptying-correction interval. Without that validation, the row sits in its own category in the main table above with yellow shading and a "Model only" badge to signal that it is mathematical model potential, not a validated short-window intensity product.

A3. Additional visualization

Figure A2. Required rainfall depth as a function of the relative uncertainty target q for one representative row from each category, in short-window intensity context. The Lambrecht hi-res scale-state model curve sits at the bottom (lowest threshold), the IoT³ phase-aware B3/B3 short-window curve next, then siphon TBR, raw-pulse TBR, and finally the weighing public envelope (a hyperbola in q because the floor is a fixed amount-resolution rather than a stochastic per-tip floor).

A4. Conflict-of-interest and funding statement (full)

The author is the chief executive officer and a founder of Barani Design Technologies, the manufacturer of the MeteoRain product family included in the comparison. The MeteoRain IoT³ rows occupy several positions in the upper-middle of the ranking (blue category). The Lambrecht hi-resolution scale-state and pulse-state model rows (yellow category) sit above the MeteoRain IoT³ rows in the table because they have the smallest mathematical state resolution; they are model-potential layers that the author does not manufacture and that are presented with their full caveat about response-gating validation. The author has no financial relationship with the other manufacturers (KISTERS / HyQuest, OTT HydroMet, Lambrecht, Geolux, Vaisala, Texas/Campbell, Casella, Davis, Onset HOBO, Met One, RainWise, MicroStep / Meteoservis, AEM/FTS, CAE, Pronamic, Seven Sensor Solutions, EML).

The work was not funded by any vendor of any compared product. No external party reviewed, edited, or approved this article prior to publication. All inputs are publicly available datasheets and operating manuals; no proprietary, internal, or vendor-supplied data was used for any product, including the author's own products. Conservative modelling parameters are applied uniformly: U95 = 2σ_total (GUM coverage factor k = 2, more conservative than a triangular-distribution k = 1.90); γ_s = 1 for siphon TBRs; B3/B3 only for IoT³ phase-aware rows when the reporting window is interior to active rain (the assumption that defines short-window intensity in the first place — for accumulation totals where the assumption fails, the IoT³ rows revert to B0/B0 in the companion accumulation ranking).

Designing a measurement instrument requires a working uncertainty model of the same instrument; the author's role as instrument designer is therefore not separable from the author's role as analyst. The appropriate response to this dual role is transparency rather than recusal. Readers who suspect bias are encouraged to substitute alternative parameter values into the formulas in section A1, re-run any sample calculation in section A2, and verify whether the conclusions change. The full peer-reviewed manuscript with detailed derivations is available on request.

A5. Source notes and verification

IMD / Astra-type 200 cm² TBRG was added from the IMD Pune AWS training document, which lists Astra TBRG collector diameter 159.6 mm, collector area 200 cm², 0.5 mm rainfall resolution, and 10 cm³ / 10 mL per tip. IMD Pune AWS datalogger and sensors training PDF.

WMO dynamic-response support: the WMO Past CIMO Intercomparisons summary states that weighing gauges can show lower uncertainty than tipping-bucket gauges under constant flow after stabilization, and also states that rainfall-intensity measurement is affected by acquisition-system response time, internal software filtering caused significant delays, and only one weighing instrument met the WMO 1-minute rainfall-intensity requirement. The WMO/JMA laboratory-intercomparison summary describes the weighing-gauge step-response test by switching flow from 0 to 200 mm/h and back to 0 and observing stabilization with delay resolution finer than 1 minute.

Apogee Cloudburst and Geonor T-200B are listed as unranked weighing references in this revision. Apogee publishes cumulative amount and rate/intensity accuracy together with filtering for evaporation, vibration, and temperature, while Geonor publishes a vibrating-wire weighing architecture and sensitivity better than 0.1 mm. Neither linked public document provides the dynamic filter/noise/time-response model needed for the transparent short-window or event-total ranking used in the main tables.

BARANI MeteoRain product sizes and IoT³ descriptions: MeteoRain product overview and MeteoRain IoT.

KISTERS / HyQuest TB4 Series II rows: documented siphon storage volume V_s = 12 mL applied with γ_s = 1 conservative residual fraction. Reference: KISTERS TB4 Series II user manual (publicly available).

Geolux RG200/RG400 siphon rows: working values RG200 ≈ 8 mL and RG400 ≈ 16 mL, both at approximately 4 mL/tip. Seven Sensor Solutions 3S-RG is treated as a non-siphon 200 cm² 0.2 mm tipping bucket.

OTT Pluvio² S/L treatment: Intensity RT and Accu NRT / Accu total NRT are different output products with different floors. The Intensity RT product (native real-time 1-minute intensity, ±6 mm/h floor at 1%) is the row that matters most for short-window intensity; the Accu NRT amount-derived row (10 mm at 1%) is shown for reference because it defines the public-envelope amount floor.

Lambrecht rain[e] family: public envelope (0.1 mm or 1% amount accuracy floor) and operating manual (6 measurements per minute, 60-second moving sum, self-emptying compensation, multi-stage filtering, 4-second variance output). The hi-resolution 0.001 mm scale-state and 0.01 mm pulse-state model layers are presented with strong caveats about response gating.

MPS / MicroStep-MIS TRwS weighing gauges are listed as unranked weighing references. The checked public documents publish resolution and headline intensity specifications, but they do not publish the response-time, filter-kernel, raw/filtered noise, output-delay, or residual compensation-error data required for a transparent short-window dynamic ranking. References: MPS TRwS_E and MicroStep-MIS TRWS_E.

Additional gauges added in this revision: Précis Mécanique 3039/1 dynamic bucket (1000 cm², 0.1 mm), EML / In-Situ / Campbell ARG314 (314 cm², 0.1/0.2 mm public Campbell configurations, with optional 0.5 mm treated as a technical row), METER ECRN-100 (16.0 cm collector, 0.2 mm), Observator/RIMCO RIM-7499 siphon gauge (203 mm, 0.2/0.25/0.5 mm), Rika/Honde/Renke 200 mm OEM tipping-bucket classes, and Tamaya/Ikeda KDC-S13-RT-5E 200 mm / 0.5 mm. Campbell ARG100 remains represented by the existing Vaisala QMR102 / EML ARG100 / Campbell ARG100 row. SPIEA is listed as a manual accumulation reference only and is not ranked as an automatic short-window intensity product.

All other listed competitors (Vaisala, Texas/Campbell, Casella, Davis, Onset HOBO, Met One, RainWise, MicroStep / Meteoservis, AEM/FTS, CAE, Pronamic, EML) are modelled from publicly available datasheets and product manuals using the formulas in section A1 above. No proprietary data is used.

The full mathematical model, derivation, per-horizon regime selection logic, and γ_s sensitivity analysis are documented in the v23 manuscript "Low-Power Rain-Gauge Uncertainty Models" (Barani, 2026), available on request. The companion accumulation ranking article uses the same model with the boundary regime swapped to B0/B0 (event-bound).

Additional v25 ranked rows: Précis Mécanique 3039/1 is entered as a 1000 cm² / 0.1 mm pulse-output dynamic-bucket gauge; EML / In-Situ / Campbell ARG314 is entered as 314 cm² with 0.1, 0.2, and optional 0.5 mm configurations; METER ECRN-100 is entered as a 16.0 cm collector / 0.2 mm double-spoon pulse gauge; Rika, Honde, and Renke products are grouped into 200 mm diameter / 0.1, 0.2, and 0.5 mm pulse-output classes where those configurations are listed; Tamaya / Ikeda KDC-S13-RT-5E is included in the 200 mm diameter / 0.5 mm class; Observator / RIMCO RIM-7499 is entered as a 203 mm siphon-controlled TBR at 0.2, 0.25, and 0.5 mm. SPIEA is retained as a manual reference gauge only and is not ranked in automatic intensity tables.

v40 additions: CAE PMB2 / PMB2/R and ETG R102 are added as 1000 cm² / 0.2 mm pulse-output tipping-bucket rows. Their published correction algorithms are noted but not applied in the transparent required-depth model because the ranking uses the public collector area, tip depth, and state model rather than unpublished or product-specific correction code.

V42 WMO/historical additions. Added ranked rows include FTS/AEM RG-T options, KISTERS/HyQuest TB6/TB3 variants, AP23/PAAR, Meteoservis MR3H, Thies PT, R01 3070 / Précis-Mécanique, SIAP+MICROS TP1000 / SIAP UM7525, MTX PP040, LSI Lastem DQA031, WaterLOG H-340SDI, India Met Dept. TBRG Mk2, Yokogawa WMB01, and Hydrological Services TB-3 exact siphon row. Alias-only labels and reference-only non-catchment/weighing rows are separated so duplicate names do not distort the ranked catchment-gauge tables.

SIAP+MICROS TP200 is added as a 200 cm² / 0.2 mm pulse-output tipping-bucket row based on the TP200 technical sheet. SIAP+MICROS TPW / TPWE weighing gauges are listed in the unranked weighing-reference table because the public TPW/TPWE documentation publishes resolution and compensation-processing claims, not the time constant/filter/noise model needed for a transparent dynamic ranking. Zoglab RG100 is added as a 200 cm² / 0.1 mm pulse-output tipping-bucket row based on its public product page. The SIAP+MICROS TP500/TP1000 current portfolio page was reviewed; TP500 is added as a 500 cm² / 0.2 mm pulse-output row from the TP500/TP1000 manual. TP1000 is represented as an alias on the existing 1000 cm² / 0.2 mm SIAP UM7525 / T-PLUV UM7525/I row, because the current TP1000 manual gives the same 1000 cm² collecting area and 0.2 mm/impulse conversion constant. KISTERS/HyQuest TB7 is added as a non-syphoning 200 mm catch-diameter tipping-bucket gauge with 0.2 mm, 0.5 mm, and 0.01 inch resolution options.

v46 additions. KISTERS/HyQuest TB7 is added as a non-syphoning 200 mm catch-diameter tipping-bucket gauge with 0.2 mm, 0.5 mm, and 0.01 inch resolution options from the KISTERS TB7 product page. SIAP+MICROS TP500 is added as a 500 cm² / 0.2 mm pulse-output row from the TP500/TP1000 manual. SIAP+MICROS TP1000 is added as an alias to the existing 1000 cm² / 0.2 mm SIAP UM7525 / T-PLUV UM7525/I row, because it has the same collecting area and 0.2 mm/impulse conversion constant.