HOBO Data Logging Rain Gauge - RG3

English version (includes data logger)

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IMPORTANT: This HOBO data logger requires HOBOware software and a communications device. See compatible items below.

RG3 Internal ViewRecord up to 160 in. of rainfall at rates up to 12.7 cm (5 in.) per hour. The Data Logging Rain Gauge system is battery powered and includes a HOBO® Pendant Event data logger with a tipping-bucket rain gauge. Easily collect rainfall, time, and duration data, as well as temperature when used with an optional solar radiation shield (RS1 Solar Radiation Shield, or M-RSA). Base station or shuttle is required.


  • High quality tipping-bucket rain gauge includes a HOBO Pendant Event data logger. Base station or shuttle is required.
  • Time and date stamp is stored for each tip - provides detail needed to determine rainfall rates and duration
  • Reliable, field-proven rain gauge
  • Externally Mounted pendant event loggerAlso records temperature when used with an optional solar radiation shield

The RG3 Data Logger is for use in Outdoor environments

The RG3 Data Logger supports the following measurements:


Onset # RG3
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Items you may need to complete your order Help

Note: A complete system requires a data logger, software, and communications. Sold Separately.
(See our metric version RG3-M)

BASE-U-4 Optic USB Base Station $124
Software - HOBOware Pro $99

RG3 HOBO Rain Gauge Data Logging System

Rain Gauge
Maximum rainfall rate: 12.7 cm (5 in.) per hour

Calibration accuracy: ±1.0% (up to 1 in./hour for the RG3 or 20 mm/hour for the RG3-M)

Resolution: 0.01 in. (RG3) or 0.2 mm (RG3-M)

Calibration: Requires annual calibration: can be field calibrated or returned to the factory for re-calibration

Operating temperature Range: 0° to +50°C (+32° to +122°F)

Storage temperature Range: -20° to +70°C (-4° to +158°F)

Environmental rating: Weatherproof

Housing: 15.24cm (6-in.) aluminum bucket

Tipping bucket mechanism: Stainless steel shaft with brass bearings

Dimensions: 25.72 cm height x 15.24 cm diameter (10.125 x 6 in.); 15.39 cm (6.06 in.) receiving orifice

Weight: 1.2 Kg (2.5 lbs)

Part numbers: RG3 (0.01 in. per tip) ; RG3-M (0.2 mm per tip)

The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

Time stamp: Resolution 1.0 second

Time accuracy: ± 1 minute per month at 25°C (77°F), see Plot B on page 10.

Operating range: -20° to 70°C (-4° to 158°F)

Environmental rating (for logger used outside of rain gauge): Tested to NEMA 6 and IP67; suitable for deployment outdoors

NIST traceable certification: Available for temperature only at additional charge; temperature range -20° to 70°C (-4° to 158°F)

Battery: CR-2032 3V lithium battery; 1 year typical use

Memory: 64K bytes – 16K to 23K tips when recording rain only; 25K to 30K data points when recording rain and temperature

Materials: Polypropylene case; stainless steel screws; Buna-N o-ring; PVC cable insulation

The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

Temperature Measurement
Measurement range: -20° to 70°C (-4° to 158°F)

Accuracy: ± 0.47°C at 25°C (± 0.85°F at 77°F). A solar radiation shield is required for accurate temperature measurements in sunlight.

Resolution: 0.10°C at 25°C (0.18°F at 77°F), see Plot A on page 10.

Drift: Less than 0.1°C/year (0.2°F/year)

Response time: Airflow of 1 m/s (2.2 mph): 10 minutes, typical to 90%

Part Number
Graphing and Analysis
HOBOware Pro Mac/Win (USB cable included)

HOBOware Pro - Mac/Win Data Logger Software - Download Only

Part Number
Data Offload - Base Stations - Shuttles
Optic USB Base Station for Pendant

Optic USB Base Station

HOBO® Waterproof Shuttle

Part Number
Replacement batteries for several loggers (Pack of 5)

Desiccant Replacement Pack for UA-003

Part Number
Carrying Case
Pelican Case

Data Offload Couplers
Replacement Pendant Coupler for BASE-U-1

A Replacement Coupler for BASE-U-4

Documentation for the RG3


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