HOBO U22-001 – Water Temperature Pro v2 Data Logger

SKU: U22-001


The durable HOBO Water Temp Pro v2 has 12-bit resolution and a precision sensor for ±0.2°C accuracy over a wide temperature range. Designed with a durable streamlined case for extended deployment in fresh or salt water, the Water Temp Pro v2 is equipped with an Optic USB interface for data offload in the field, even when the data logger is wet. For accurate ambient air temperature measurement in sunlight a solar radiation shield is required (RS1 Solar Radiation Shield, assembly required; M-RSA pre-assembled Solar Radiation Shield).

  • 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


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


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

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