Highlighted Features

    Research-grade measurements at an affordable price
    Waterproof to 120 meters
    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


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


Operation range†: -40° to 70°C in air; maximum sustained temperature of 50°C in water
Accuracy: ±0.21°C from 0° to 50°C
Resolution: 0.02°C at 25°C
Response time: (90%) 5 minutes in water; 12 minutes in air moving 2 m/sec (typical)
Stability (drift): 0.1°C per year
Real-time clock: ± 1 minute per month 0° to 50°C
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
Dimensions: 3.0 cm (1.19 in.) maximum diameter, 11.4 cmlength; mounting hole 6.3 mm diameter
Wetted materials: Polypropylene case, EPDM® o-rings, stainless steel retaining ring
Buoyancy (fresh water): +13 g in fresh water at 25°C; +17 g with optional boot
Waterproof: To 120 m
Shock/drop: 1.5 m drop at 0°C to 70°C
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
Environmental Rating: IP68

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.