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Data Loggers

The HOBO Pro v2 Temperature/External Temperature data logger is a weatherproof data logger with an external soil/water temperature sensor on a 6-foot cable useful for situations where just one temperature probe is required. An internal temperature sensor is also included.


Weatherproof housing for use in outdoor or condensing environments
High accuracy
Replaceable Relative Humidity sensor provides fast response and superior recovery from condensing conditions
Small-diameter external sensor versions for measurements in tight spaces
Optic USB interface for fast and reliable download
Environment: Outdoor
Measurement: Temperature


Temperature Sensor
Operation range:
Internal sensors: -40° to 70°C (-40° to 158°F)
External sensors: -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
Accuracy: 0.2°C over 0° to 50°C (0.36°F over 32° to 122°F); see Plot A
Resolution: 0.02°C at 25°C (0.04°F at 77°F); see Plot A
Response time: (typical to 90%)
Internal sensors: 40 minutes in air moving 1 m/sec
External sensors: 3 minutes in air moving 1 m/sec; 30 seconds in stirred water
Stability (drift): < 0.1°C (0.18°F) per year

Operation range: -40° to 70°C (-40° to 158°F)
Real-time clock: ± 1 minute per month 0° to 50°C (32° to 122°F)
Battery: 1/2 AA, 3.6 Volt lithium, user-replaceable (part # HP-B)
Battery life (typical use): 3 years with 1 minute or greater logging interval
Memory (non-volatile): 64K bytes memory (approx. 21,000 temperature and RH measurements)
Materials: ASA styrene polymer housing and mounting clamp; polypropylene protective cap; Buna-N o-ring(s)
Cables: One 184 cm (6 ft.) PVC cable; sensor diameter 0.5 cm (0.20 in.)
Environmental rating: Electronics housing is NEMA 6P equivalent (tolerant of brief submergence)
Units with RH sensors are NEMA 4 equivalent (splash-resistant)
Launch modes: Immediate start; delayed start
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)
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.
Weight: 102 g (2.7 oz)
Dimensions: Housing measures 10.2 × 3.8 cm (4.0 × 1.5 in.)
NIST certificate Temperature certificate available for additional charge
The CE Marking identifies this product as complying with the relevant directives in the European Union (EU).

Producing Area:USA

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