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Pro v2 Water Temperature Data Logger


The 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..

  • Brands Onset
  • Product Code: U22-001
  • Availability: 7-10 Days

Tags: u22-001, water, temp, pro, v2, durable, 12-bit, resolution, temperature, hoboware, waterproof

Water Temperature Pro v2 Data Logger

The 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 Temperature


For more information visit Onset



  • HOBO U22-001 Water Temp Pro V2
  • Communications window protective cap



Product Datasheet/s

Product Operation Document/s

Product Software/Applications

U22-001 Datasheet HOBO® Water Temp Pro v2 (U22-001) Quick Start HOBOware® software (free)
  HOBO Water Temp Pro v2 (U22-001) User's Manual HOBOware® Pro software


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.


White Papers

On-Demand Webinars

How-To Videos

Product Overview Videos

Informational Pages


Application Stories

Additional Related Content

Tech Notes

Forum Postings

Choosing A Water Level Logger: 5 Things You Should Know Critical Success Factors in Water Level Monitoring HOBOware Menus Explained Part 1 HOBO Water Temp Pro v2 Data Logger U22 Tips on Buying a Data Logger Demystifying Water Level Logger Accuracy Specifications Addressing Root Causes of Declines in Freshwater Health   A deployment method for turbulent water Found a water temp pro V2 sensor on Florida Beach. SN: 9827870
Underwater Temperature Loggers: Considerations For Selection & Deployment Data Logger Basics HOBOware Menus Explained Part 2   What is a Data Logger? Solar Photovoltaic Array Monitoring at Allegheny College An interview with Tim Noyes, Research Specialist at Bermuda Institute of Ocean Sciences   Barometric Compensation Method  
  Groundwater Monitoring with HOBO Data Loggers HOBOware Pro's Barometric Compensation Assistant     Underwater Temperature Loggers Dive into the Bahamas' "Black Holes" Blue and Green: A Study of Urban Green Roof Performance at the Indigo and Cyan Buildings in Portland, Oregon   Data Assistant Videos on YouTube  
  HOBO U20L Series Introduction and Water Level Logger Deployment Tips How to automatically launch multiple HOBO USB data loggers     Underwater Temperature Loggers: Considerations for Selection and Deployment Monitoring Environmental Impact off Qatar’s Coastal Waters   Deploying water temp and water level loggers or developing a QAPP  
  HOBO Water Logger Deployment Considerations - Ask the Experts! How to automatically readout and save data from a HOBO USB data logger       Monitoring Supports Coastal Environmental Impact Study in South Korea   How do I delete, erase, or clear data from my data logger's memory?  
  Low-Cost Monitoring of Stormwater Control Measures Using Water Level Loggers How to change your default units preference in HOBOware       Scientists Study Coral Health in Seychelles Islands   Optic data logger not recognized by HOBOware using Windows 8.1 or Windows 10  
  Monitoring Water Quality with HOBO Data Loggers How to import text files into HOBOware Pro       Study Points to Potentially Harmful Increase in Golf Stream Water Temperatures   Proper Coupler Seating, BASE-U-4 (Optic Base station) and the U-DTW-1 (Waterproof Shuttle)  
  Simplify Data Collection with First Bluetooth Water Level Logger for Mobile Devices How to navigate the HOBOware plot screen       Underwater Data Loggers Assist in Coral Reef Health Research   Using 3rd-party barometric pressure data for compensation  
  Using Water Quality Loggers to Manage Native Fish Habitats Visit Onset's YouTube Channel       Underwater Loggers Aid Discovery of Prehistoric Fish   Water Level Quick Test  
Enclosure 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
Launch Modes Immediate start and delayed start
Logger Accuracy ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F)
Logger Battery Indication Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.
Logger Battery Life 6 years with 1 minute or greater logging interval
Logger Battery Type 2/3 AA, 3.6 Volt Lithium, factory-replaceable ONLY
Logger Environmental Rating IP68
Logger Memory 64K bytes memory (approx. 42,000 12-bit temperature measurements)
Logger Offload Modes Offload while logging; stop and offload
Logger Operating Range -40° to 70°C (-40° to 158°F) in air; maximum sustained temperature of 50°C (122°F) in water
Logger Resolution 0.02°C at 25°C (0.04°F at 77°F)
Logger Shock/Drop
Logger Waterproofing To 120 m (400 ft.)
Logger Weight 42 g (1.5 oz)
Logger Wetted Materials Polypropylene case, EPDM® o-rings, stainless steel retaining ring
Logging Intervals 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.
Real-time Clock ± 1 minute per month 0° to 50°C (32° to 122°F)
Response Time
Response Time Temperature (90%) 5 minutes in water; 12 minutes in air moving 2 m/sec (typical)
Safety and Regulatory
Safety and Regulatory CE The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).
Temperature Sensor
Temperature Sensor Drift 0.1°C (0.18°F) per year