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Onset HOBO U22-001 Underwater Temperature Data Logger

Underwater Temperature Data Logger

Onset HOBO Underwater Temp Logger for Extended Deployment in Fresh or Salt Water

Part Number: U22-001

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  • -20°C to 50°C Water Measurement Range with ±0.2°C Accuracy

  • 6 Year Non-Replaceable 3.6 Volt Lithium Battery

  • Stores up to 42,000 Recorded Temperature Readings

  • Waterproof to 120 Meters (400 ft)

Requires Communication Device BASE-U-4 Optic USB Base Station or U-DTW-1 Waterproof Shuttle (U-DTW-1 Requires HOBOware PRO BHW-PRO-DLD)

Availability: Low stock


All Calibration Orders Have a 5 to 7 Business Day Lead Time
1 Year Calibration Due Date Unless Otherwise Specified


Onset HOBO® U22-001 Underwater Data Logger Specifications

Accuracy ±0.2°C (0°C to 50°C)
±0.36°F (32°F to 122°F)
Resolution 0.02°C at 25°C
0.04°F at 77°F
Measurement Range Water: -40°C to 50°C Max (-40°F to 122°F)
Air: -40°C to 70°C (-40°F to 158°F)
Time Accuracy ±1 Minute/Month
Data Storage Capacity 42,000 12-bit Samples/Readings
Sampling Interval 1 Second to 18 Hours (User-Selectable via Software)
Power Source One (1) 3.6 V Lithium Battery (Non-Replaceable)
Battery Life 6 Years (Dependant on Sampling Interval and Environment)
Response Time Water: 5 minutes
Air: 12 minutes Moving 2 m/sec, Typical to 90%
Memory Modes Stop when Full
Data Offload < 30 seconds when full
Wetted Materials Polypropylene, Stainless Steel, EPDM O-ring
Software Compatibility HOBOware PRO Version 3.2+
OS Compatibility Windows: Windows 10, 8.1, 8 and 7
Mac: OS X 10.9.x, 10.10.x and 10.11.x
Standards Compliance CE
Buoyancy Fresh Water at 25°C: =13 g (0.5 oz)
With Optional Boot: +17 g (0.6 oz)
Dimensions 11.4 cm x 3.0 cm (4.5" x 1.19") with 6.4 mm (0.25") hole in mounting bail
Weight 42 g (1.5 oz)

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  • Answer:

    While the loggers are tested for accuracy during manufacturing they do not come with a calibration certificate.  If you require a calibration certificate it must be purchased as an option.

    We generally recommend recalibrating on an annual basis.  Keep in mind that the only thing the calibration does for these loggers is validate the accuracy.   There is no way to adjust the logger or apply an offset.

    Because of this there is no published instruction guide on calibrating the loggers. 

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