The HOBO MX2201 waterproof 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!
Convenient wireless setup and download via Bluetooth Low Energy (BLE)
Large memory stores 96,000 measurements
Waterproof to 30 meters (100 feet)
Mounting tabs for fast, easy deployment
LED alarm notifies you when temperature exceeds set threshold
Works with Onset’s free HOBOmobile 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 Temperature
Temperature Sensor (MX2201 and MX2202)
-20° to 70°C (-4° to 158°F) in air
-20° to 50°C (-4° to 122°F) in water
Accuracy：±0.5°C from -20° to 70°C (-4° to 158°F)
Drift：<0.1°C (0.18°F) per year
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
Waterproof：To 30.5 m (100 ft)
Battery：CR2032 3V lithium, user replaceable
1 year typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Always Off disabled in software.
2 years typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Always Off enabled 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
Dimensions：3.35 x 5.64 x 1.6 cm (1.32 x 2.22 x 0.63 inches)
Weight：12.75 g (.45 oz)
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.