Onset HOBO U22-001 Pro v2 Water Temperature Data Logger

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Part Number: U22-001

Manufacturer: Onset



Key Features:

  • Research-grade measurements at an affordable price
  • Waterproof to 120 meters (400 feet)
  • Data readout in less than 30 seconds via fast Optic USB interface
  • Compatible with HOBOware and HOBOware Pro software for logger setup, graphing and analysis

Availability: In stock

Our Price: $129.00

Availability: In stock

Product Detail


     The HOBO U22-001 Water Temp Pro v2 datalogger computes temperatures between -40°C and 70°C (-40°F to 158°F) in air and up to an astounding 50°C (122°F) in water. The logger comes equipped with ± 0.2°C accuracy. The optical USB interface allows the offloading of data while the logger is wet or underwater. It’s durable, streamlined casing comes with 12-bit resolution adding to the benefit of it being waterproof providing for extended operation in both fresh air and salt water.

     A solar radiation shield is required to acquire precise air temperature measurements in sunlight. (RS1 Solar Radiation Shield, assembly required, or M-RSA pre-assembled Solar Radiation Shield. 


IMPORTANT: This HOBO data logger requires HOBOware software and a communications device.

Optical Interface for data transfer.






Operation range: -40° to 70°C (-40° to 158°F) in air; maximumsustained temperature of 50°C (122°F) in water

Accuracy: ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F)

Resolution: 0.02°C at 25°C (0.04°F at 77°F)

Response time: (90%) 5 minutes in water; 12 minutes in air moving 2 m/sec (typical)

Stability (drift): 0.1°C (0.18°F) per year

Real-time clock: ± 1 minute per month 0° to 50°C (32° to 122°F)

Battery: 2/3 AA, 3.6 Volt Lithium, factory-replaceable ONLY

Battery life (typical use): 6 years with 1 minute or greater logging interval

Memory (non-volatile): 64K bytes memory (approx. 42,000 12-bit temperature measurements)

Weight: 42 g (1.5 oz)

Dimensions: 3.0 cm (1.19 in.) maximum diameter, 11.4 cm (4.5 in.) length; mounting hole 6.3 mm (0.25 inches) diameter

Wetted materials: Polypropylene case, EPDM® o-rings, stainless steel retaining ring

Buoyancy (fresh water): +13 g (0.5 oz.) in fresh water at 25°C (77°F); +17 g (0.6 oz.) with optional boot

Waterproof: To 120 m (400 ft.)

Shock/drop: 1.5 m (5 ft.) drop at 0°C to 70°C (32°F to 150°F)

Logging interval: Fixed-rate or multiple logging intervals, with up to 8 user-defined logging intervals and durations; logging intervals from 1 second to 18 hours. Refer to HOBOware software manual.

Launch modes: Immediate start and delayed start

Offload modes: Offload while logging; stop and offload

Battery indication: Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.

NIST certificate Available: for additional charge

The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).


IMPORTANT: The plastic case will become brittle at temperatures lower than -20°C. If the logger is deployed in a location where the temperature drops below -20°C, make sure the logger remains stationary and is not pulled on or struck. Return the logger to above -20°C before handling.

Data Sheet Resources


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Environment: The U22-001 Data Logger is for use in Outdoor and Underwater environments

Measurements: The U22-001 Data Logger supports the following measurements: Temperature, Water Temp



Our Price: $249.00

Our Price: $124.00

Our Price: $99.00