Product External Temperature/RH Sensor Data Logger

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A weatherproof data logger with external temperature and relative humidity sensors. Leveraging Bluetooth technology for easy setup and data download directly to your mobile device or Windows computer running Onset’s free HOBOconnect app, this logger delivers high-accuracy measurements in harsh outdoor environments.


  • Convenient wireless setup and download via Bluetooth (100-foot range)
  • Retrieve data in hard-to-reach locations
  • Visual alarms alert you to out-of-range conditions
  • Compact, weatherproof housing with built-in mounting
  • View current data in real time with Onset’s free HOBOconnect app
  • Share downloaded data easily from your mobile device
  • Accuracy: +/- 0.2C° and +/- 2.5% RH


External Temperature/RH Sensor Data Logger may require Solar Radiation Shield during installation.

Use Radiation Shield with external sensors for improved temperature measurement accuracy in locations exposed to sunlight. The small size and unobstructed airflow of this shield provides a faster response to changing conditions than larger radiation shields.

Solar Radiation Shield works with most of  external temperature and temperature/relative humidity sensors.


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