HOBO TidbiT v2 Water Temperature Data Logger at R-M1971_WS

several of these sensors are used at weather station "R-M1971_WS" for measurement of soil temperature and air temperature on soil surface

technical description:

Temperature Sensor
Operation range:* -20° to 70°C (-4° to 158°F) in air; maximum sustained temperature of 30°C (86°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: 5 minutes in water; 12 minutes in air moving 2 m/sec; 20 minutes in air moving 1 m/sec (typical to 90%)
Stability (drift): 0.1°C (0.18°F) per year

Logger
Real-time clock: ± 1 minute per month 0° to 50°C (32° to 122°F)
Battery: 3 Volt lithium, non-replaceable
Battery life (typical use): 5 years with 1 minute or greater logging interval
Memory (non-volatile): 64K bytes memory (approx. 42,000 12-bit temperature measurements)
Weight: 19.6 g (0.69 oz)
Dimensions: 3.0 × 4.1 × 1.7 cm (1.2 × 1.6 × 0.68 in.); mounting bail 4.6 mm (3/16 in.) diameter hole
Wetted materials: Epoxy case
Waterproof: To 305 m (1000 ft.)
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, delayed start
Offload modes: Offload while logging; stop and offload
Battery indication: Battery level can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.

Environmental Rating: IP68


Further information see: https://www.onsetcomp.com/products/data-loggers/utbi-001