The HOBO MX2201 water temperature logger leverages the power of Bluetooth Low Energy (BLE) to deliver accurate temperature measurements straight to your iOS or Android mobile device. 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!

    Highlighted Features

    • Convenient wireless setup and download via Bluetooth Low Energy (BLE)
    • Large memory stores 96,000 measurements
    • Waterproof to 30 meters (100 feet)
    • User-replaceable battery
    • Mounting tabs for fast, easy deployment
    • LED alarm notifies you when temperature exceeds set threshold
    • Works with Onset’s free HOBOconnect app
    • ±0.5°C (±0.9°F) accuracy

    In what environment does this data logger operate?
    This data logger operates in indoor, outdoor and underwater environments.

    What measurements does this data logger support?
    The MX2201 data logger supports the following measurements: Temperature and Water Temp



    Temperature Sensor (MX2201)


    -20° to 70°C (-4° to 158°F) in air

    -20° to 50°C (-4° to 122°F) in water


    ±0.5°C from -20° to 70°C (-4° to 158°F)


    0.04°C (0.072°F)


    <0.1°C (0.18°F) per year

    Response Time

    17 minutes typical to 90% in air moving 1 m/s, unmounted

    7 minutes typical to 90% in stirred water, unmounted



    Radio Power

    1 mW (0 dBm)

    Transmission Range

    Approximately 30.5 m (100 ft) line-of-sight

    Wireless Data Standard

    Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0)

    Logger Operating Range

    -20° to 70°C (-4° to 158°F) in air

    Logging Rate

    1 second to 18 hours

    Buoyancy (Fresh Water)

    2g (0.07 oz) positive


    To 30.5 m (100 ft)


    96,000 measurements


    CR2032 3V lithium, user replaceable

    Battery Life

    1 year typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Always On in software.

    2 years typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Always Off in software.

    Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life.

    To ensure proper battery installation, see Battery Information for detailed instructions on replacing the battery.

    Time Accuracy

    ± 1 minute per month at 25°C (77°F)

    Full Memory Download

    Approximately 45 seconds; may take longer the farther the device is from the logger

    Wetted Materials

    Polypropylene case, EPDM O-ring


    3.35 x 5.64 x 1.8 cm (1.32 x 2.22 x 0.69 inches)


    12.75 g (.45 oz)





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