HOBO Rain Gauge Data Logger

Part # RG3
US version (includes data logger)
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HOBO data loggers requires HOBOware software (USB interface cable included w/CD purchase) and a communications device. See compatible items below.


Record 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.

Externally Mounted pendant event logger

Highlighted Features

  • 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.
  • Compatible with HOBOware and HOBOware Pro software for logger setup, graphing and analysis.
  • Also records temperature when used with an optional solar radiation shield.

In what environment does this data logger operate?

This data logger operates in an outdoor environment.

What measurements does this data logger support?

The RG3 data logger supports the following measurement: Rainfall

To see the full specifications for this product, please see our product manual found under the documentation tab if available.

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%

Graphing and Analysis
HOBOware Pro Mac/Win (USB cable included)
HOBOware Pro - Mac/Win (Download Only)
Data Offload - Base Stations - Shuttles
Optic USB Base Station for Pendant
Optic USB Base Station
HOBO® Waterproof Shuttle
Replacement batteries (Pack of 5)
Desiccant Replacement Pack for UA-003
Carrying Case
Pelican Case
Data Offload Couplers
Replacement Pendant Coupler for the BASE-U-1
A Replacement Coupler for BASE-U-4
Documentation for the RG3

Rain-Gauge-Data-Sheet logo
Rain Gauge Data Sheet

Data Logging Rain Gauge (RG3, RG3-M) User's Manual