Data Logging Rain Gauge (Metric)
Product Code: RG3-M
The Onset® HOBO® RG3-M is a self-contained, battery-powered metric data logging rain gauge designed for accurate, long-term rainfall monitoring in environmental, agricultural, hydrological, and research applications. The instrument combines a high-quality tipping-bucket rain gauge with an integrated HOBO Pendant Event data logger, automatically recording the date and time of every bucket tip to provide detailed rainfall totals, intensity, duration, and storm event analysis. With a 0.2 mm rainfall resolution, weatherproof aluminium construction, and the ability to also record ambient temperature using an optional solar radiation shield, the RG3-M is ideal for unattended outdoor deployments in demanding environments.
A HOBO® Pendant Optic USB Base Station, or HOBO® Waterproof Shuttle and HOBOware™ Pro software (each sold separately) are required to connect the rain gauge to a computer for launch and readout. The rain gauge features a removable top for easy data offload, three mounting feet for setup on level surfaces (three screws included), and a side bracket for mast mounting (hose clamps included).
Product Specifications:
| Specification | Details |
|---|---|
| Manufacturer | Onset Computer Corporation |
| Model | HOBO® RG3-M |
| Product Type | Metric data logging tipping-bucket rain gauge |
| Rainfall Resolution | 0.2 mm per bucket tip |
| Maximum Rainfall Rate | 127 mm/hour (5 in./hour) |
| Calibration Accuracy | ±1% up to 20 mm/hour |
| Rainfall Capacity | Up to 3,200 mm total rainfall |
| Collector Diameter | 15.4 cm (6.06 in.) |
| Housing Material | Aluminium collector with weatherproof housing |
| Tipping Bucket | Stainless steel shaft with brass bearings |
| Logger Memory | 16,000–23,000 rainfall events (rain only); 25,000–30,000 data points with rainfall and temperature |
| Temperature Measurement | Built-in logger sensor (requires optional radiation shield for accurate ambient air measurements) |
| Temperature Range | -20 to 70°C |
| Temperature Accuracy | ±0.47°C at 25°C |
| Battery | One CR2032 3 V lithium battery |
| Typical Battery Life | Approximately 1 year |
| Operating Temperature | 0 to 50°C (rain gauge); logger -20 to 70°C |
| Dimensions | 25.7 cm H × 15.2 cm diameter |
| Weight | Approximately 1.2 kg |
| Environmental Rating | Weatherproof |
