A waterproof data logger with both an internal sensor and an external sensor that’s designed for monitoring fast-changing temperatures; can be deployed just above water or soil, for the most convenient wireless data download to your mobile device or laptop.
Requires a compatible mobile device or Windows computer and the HOBOconnect app. System requirements for the app can be found at the bottom of the HOBOconnect software page.
Probe | -40 to 100°C (-40 to 212°F), with tip and cable immersion in fresh water up to 50°C (122°F) for one year
Logger | -20° to 70°C (-4° to 158°F) in air; -20° to 50°C (-4° to 122°F) in water, maximum sustained temperature in water 30°C (86°F)
±0.25°C from -40 to 0°C
(±0.45 from -40 to 32°F)
±0.2°C from 0 to 70°C
(±0.36 from 32 to 158°F)
±0.25°C from 70 to 100°C
(±0.45 from 158 to 212°F)
±0.25°C from -20° to 0°C
(±.45°F from -4° to 32°F)
±0.2°C from 0° to 70°C
(±0.36°F from 32° to 158°F)
<0.1°C (0.18°F) per year
Probe | 3 minutes in air moving 1 m/sec; 20 seconds in stirred water
Logger | 15 minutes typical to 90% in air moving 1 m/s, unmounted; 4 minutes typical to 90% in stirred water, unmounted
Logger Operating Range
-20° to 70°C (-4° to 158°F)
Buoyancy (Fresh Water)
14.26 g (0.50 oz) negative
To 30.5 m (100 ft)
1 mW (0 dBm)
Approximately 30.5 m (100 ft) line-of-sight
Wireless Data Standard
Bluetooth Low Energy (Bluetooth Smart)
1 second to 18 hours
±1 minute per month at 25°C (77°F)
CR2477 3V lithium, non-replaceable
3 years, typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Always Off disabled in software.
5 years, typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Always Off enabled in the app.
Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may affect battery life.
Full Memory Download Time
Approximately 45 seconds; may take longer the farther the device is from the logger.
Epoxy case, Santoprene (TPE) boot
4.06 x 6.99 x 3.51 cm (1.6 x 2.75 x 1.38 inches)
External temperature sensor diameter: 0.53 cm (0.21 in.)
External sensor cable length: 2 m (6.56 ft.)
70.0 g (2.47 oz.)