Onset HOBO Pendant MX2201 Water Temperature Data Logger

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Part Number: MX2201

Manufacturer: Onset



Key Features:

  • Convenient wireless setup and download via Bluetooth Low Energy (BLE)
  • Large memory stores 98,000 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 HOBOmobile app
  • ±0.5°C (±0.9°F) accuracy

Availability: In stock

Our Price: $54.00

Availability: In stock

Product Detail


Equipped with the power of Bluetooth Low Energy (BLE) the Onset HOBO MX2201 water temperature logger provides precision temperature measurement directly to iOS or Android mobile devices. Compact and rugged, the logger is perfect for temperature measurement in lakes, streams, oceans and soil environments.



Temperature Sensor (MX2201 and MX2202)
Range -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)
Resolution 0.04°C (0.072°F)
Drift <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
Waterproof To 30.5 m (100 ft)
Memory 96,000 measurements
Battery CR2032 3V lithium, user replaceable
Battery Life 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 Dowload 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.

Data Sheet Resources


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