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Onset HOBO MX2304 Outdoor Bluetooth Temperature Data Logger with External Sensor



Onset HOBO® MX2304 Outdoor Bluetooth Temperature Data Logger with External Sensor

Part Number: MX2304

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  • External Sensor for Temperature Measurements in an Outdoor Environment

  • Wireless Transmission of Recorded Readings to Phone or Tablet Using Bluetooth Smart LE Communications

  • -40°C to 100°C Measurement Range with a ±0.20°C (0°C to 70°C) Accuracy

  • User-Replaceable Lithium Battery with 2 Year Typical Life (1 Minute Sampling Rate)

  • Stores up to 84,650 Measured Readings with Date/Time Stamp if Bluetooth Communications Not Available


Includes External Temp Sensor, Screws and Zip Ties for Mounting. HOBOmobile App Available on the Apple Store (iOS) and Google Play (Android)

  • Answer:

    As long as the external sensor is the only component exposed to -40C then it won't have any effect on the battery life.

    Normal battery life at 25C is 2 years, typical with logging interval of 1 minute and Bluetooth Always On enabled; 5 years, typical with logging interval of 1 minute and Bluetooth Always On disabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life.

    While the logger itself can be used at -40c it is not recommended for long term use as it is the lower limit of the device.  Using it at this temperature will have a dramatic effect on battery.  Onset doesn't specify battery life at this temperature but it's safe to assume it will be dramatically shorter than at room temperature.

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