HOBO Water Temperature Pro v2 Data Logger

Part # U22-001
Water Temperature (400 ft.)
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HOBO data loggers requires HOBOware software (USB interface cable included w/CD purchase) and a communications device. HOBOware Pro is required when using the U-DTW-1 Waterproof shuttle. See compatible items below.


Optical Interface for data transferThe HOBO Water Temp Pro v2 is durable with 12-bit resolution. Complete with a precision sensor for ±0.2°C accuracy, this logger measures temperatures between -40°C and 70°C (-40°F to 158°F) in air and up to 50°C (122°F) in water. Its waterproof, streamlined case allows for extended deployment in fresh or salt water. Moreover, the Water Temp Pro v2’s optical USB interface makes it possible  to offload data even while the logger is wet or underwater. A solar radiation shield is required to obtain accurate air temperature measurements in sunlight (RS1 Solar Radiation Shield, assembly required; or M-RSA pre-assembled Solar Radiation Shield).

Highlighted 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

In what environment does this data logger operate?

This data logger operates in outdoor and underwater environments.

What measurements does this data logger support?

The U22-001 data logger supports the following measurements: Temperature and Water Temp

To see the full specifications for this product, please see our product manual found under the documentation tab if available.

Operation range: -40° to 70°C (-40° to 158°F) in air; maximum sustained 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.

Graphing and Analysis
HOBOware Pro Mac/Win (USB cable included)
HOBOware Pro - Mac/Win (Download Only)
Data Offload - Base Stations - Shuttles
Optic USB Base Station
HOBO® Waterproof Shuttle
Carrying Case
Pelican Case
Compliance Certificate
Covers, Tips, Feet, Boots
End Cap for Protective Black Boot - 85-CAPLUG-H20-B
End Cap for Protective White Boot - 85-CAPLUG-H20-W
Communications Window Protective Cap 5-pack for U22 and U24 Data Loggers
Covers, Tips, Feet, Boots
HOBO Water Temperature Pro Protective Boot - Black
HOBO Water Temperature Pro Protective Boot - White
Data Offload Couplers
Replacement Coupler for U20L, U22, U24, and U26 Data Loggers
NIST Certification
Setup Charge for NIST Traceable
NIST Temperature point
Documentation for the U22-001

U22-Water-Temp-Pro-v2-Logger logo
U22 Water Temp Pro v2 Logger Data Sheet

HOBO Water Temp Pro v2 (U22-001) User's Manual

The following are associated resources for this product. In general users of this product can gain insight into its possible use by utilizing the resources below.

On-demand Webinars & Videos