Water Temp Pro v2 Submersible Datalogger

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 is equipped with an Optic interface for data offload in the field, even when the logger is wet.


  • Accurate: ±0.2°C accuracy over 0° to 50°C
  • Easy to Use:
    • High-speed optic USB interface offloads full logger <30 seconds
    • Programmable start time/date; User-selectable sampling interval: 1 second to 18 hours
    • HOBO Waterproof Shuttle or HOBO U-Shuttle for convenient in-field data readout and logger relaunch (HOBO Waterproof Shuttle can also be used as a base station)
  • Reliable:
    • Factory-replaceable battery lasts 6 years (typical); temperature extremes will reduce battery life
    • Battery level indication at launch
    • Non-volatile EEPROM memory retains measurements even if battery fails
    • Blinking LED confirms operation
    • UV-stable plastic for long-term immersion in fresh or salt water
    • Optional protective boot for high water flow, flooding, or conditions with debris


  • Measurement Range: -20° to 50°C in water; -20° to 70°C in air
  • Waterproof: To 120 m (400 ft)
  • Accuracy: ±0.2°C at 0 to 50°C
  • Resolution: 0.02°C at 25°C
  • Time accuracy: ±1 minute per month
  • Capacity: Approximately 42,000 12-bit measurements
  • Response Time: 5 minutes in water, 12 minutes in air moving 2 m/sec, typical to 90%
  • Memory modes: Stop when full
  • Buoyancy: +13 g (0.5 oz) (fresh water at 25°C); +17 g (0.6 oz) with optional boot
  • Battery : One 3.6 V Lithium, factory replaceable ONLY, 6 years typical life, temperature extremes reduce battery life
  • Drop proof to 1.5 m 
  • Size/weight: 11.4 x 3.0 cm ; 42 g 
  • NIST traceable certification is available at additional cost


Software & Base Station

HOBOware Software and an Optic USB Base Station and Coupler are required for operation of the HOBO Water Temp Pro v2. The HOBO Waterproof Shuttle can also be used as a base station. The Optic USB Base Station offloads full logger in less than 30 seconds with optical interface to logger to eliminate unreliable connectors. Easy USB connection to computer. Operating Range: 0° to 50°C. The Base Station is splash-proof (connection to computer is not)

HOBO Water Temp Pro Protective Boot

The optional protective boot is designed for particularly harsh conditions. The thermoplastic elastomer boot is available in black to minimize visibility underwater or white for minimum solar radiation absorption.


About the manufacturer

Based on Cape Cod, Massachusetts, Onset has been designing and manufacturing its data loggers and monitoring solutions on site since the company's founding in 1981. Specialising in miniature, battery powered solutions, Onset data loggers are exceptional quality and value, ranging from indoor to outdoor and underwater applications. HOBO® data logger and weather station products are used around the world in a broad range of monitoring applications, from verifying the performance of green buildings and renewable energy systems to agricultural and coastal research.

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Water Temp Pro V2 brochure

File Size 216KB   Filename onset_hobo_water_temp_pro_v2_data_logger.pdf   Download

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