Onset HOBO Pendant MX Temp Logger

The Onset HOBO Pendant MX is a waterproof temperature logger ideal for measuring temperature in streams, lakes, oceans, and soil environments.


  • Convenient wireless setup and download via Bluetooth Low Energy (BLE)
  • Large memory stores 96,000 measurements
  • Waterproof to 30 meters (100 feet)

The HOBO MX 2201 is a waterproof temperature logger that leverages the power of Bluetooth Low Energy (BLE) to deliver accurate temperature measurements straight to mobile devices with Onset's free HOBOconnect app. Designed for durability, this compact waterproof logger is ideal for measuring temperature in streams, lakes, oceans, and soil environments. Data collection in the field has never been easier!


  • User-replaceable battery
  • Mounting tabs for fast, easy deployment
  • LED alarm sounds when the temperature exceeds a set threshold
  • Works with Onset's free HOBOconnect app
  • ±0.5°C (±0.9°F) accuracy
  • (1) HOBO Pendant MX temperature logger
  • (1) HOBO Pendant mounting boot
  • (2) Plastic zip ties
Questions & Answers
How can I string the HOBO Pendant sensors along a mooring line?
The optional HOBO Pendant Mounting Boot (see Accessories) offers a convenient means of securing the Pendant loggers to non-flat surfaces such as a mooring line. They are sold in a pack of 5 and include zip ties for securing to the line.
Can I bury this in soil? And will I need to dig it up to retrieve data?
Yes. The Onset HOBO Pendant MX Temp Logger can be buried in soil to collect temperature data. The signal will likely not pass through the soil, so the logger will need to be dug up in order to download data via Bluetooth.
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Onset HOBO Pendant MX Temp Logger
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