HOBO Pendant Event (Rain Gauge) Datalogger

The HOBO Pendant Event records momentary contact events and temperature.

Event data is only stored when it happens, which results in efficient memory usage while still providing detailed event data. Temperature data is recorded at a user-defined logging interval. The HOBO Pendant Event is ideal for connecting to tipping-bucket rain gauges to record detailed rainfall data.


  • External Event type: relay contact closure or rain gauge tips
  • Memory Capacity: 64K; number of data points depends on event interval
  • Compact weatherproof case can be mounted in a rain collector
  • Capacity to store over 16,000 tips, which is 160" of rainfall with a 0.01" rain gauge
  • HOBO Waterproof Shuttle or HOBO U-Shuttle for convenient in-field data readout and logger relaunch (HOBO Waterproof Shuttle can also be used as a base station)
  • Data can be viewed directly in inches or millimeters
  • Lockout eliminates false readings from tipping-bucket bounce
  • Tips are logged with time-stamps to determine rainfall intensity.

Key Specifications

  • External event input
    • Connection: 2m (6') cable with 2-wire input (24 AWG)
    • Maximum input frequency: 1 Hz
    • Resolution: 1.0 second
    • Minimum contact closure: 1 ms
    • Lockout: 500ms (to eliminate false counts from contact bounce)
  • Temperature
    • Range: -20° to 70°C
    • Accuracy: 0.47°C at 25°C; a solar radiation shield is required for accurate temperature measurements in sun.
    • Resolution: 0.10°C at 25°C
  • Data stored in non-volatile memory that retains data even if battery fails
  • Operating Range: -20° to 70°C
  • Weatherproof housing tested to NEMA 6 and IP67
  • Drop-proof to 1.5m
  • Time Accuracy: ± 1 minute/month at 25°C
  • Battery: CR2032 user-replaceable; 1-year battery life (typical)

Required Software & Communications Hardware

HOBOware Software and an Optic USB Base Station* with Coupler, are required to operate the HOBO Pendant loggers. The Optic USB Base Station includes an Optic Base Station and Pendant Coupler.

Optic USB Base Station and Coupler

The Optic USB Base Station offloads a full 64K logger in 30 seconds. The Base Station connects directly to a USB port on a computer, and the coupler connects the logger to the Base Station. The Optic Base Station is splash resistant. *The HOBO Waterproof Shuttle can also be used as a base station.

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datalogging rain gauge brochure

File Size 452KB   Filename onset_hobo_rg3_rain_gauge.pdf   Download

pendant event logger brochure

File Size 317KB   Filename onset_hobo_ua-003_pendant_event.pdf   Download

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