Sensor is attached to a 6.1m (20 ft) cable. -40° to 50°C (-40° to 122°F) in water; -40° to 100°C (-40° to 212°F) in air Housing: Copper-plated sensor tip A temperature sensor for use with HOBO U-Series external-channel data loggers this model measures temperature in air water or soil. Accuracy and resolution vary according with attached logger model. Measurement range is -40 to 50C (-40 to 122F) in water or soil -40 to 100C (-40 to 212F) in air; response time is minutes typical to 90% in air moving 1 m/sec (2.2 mph); response time in stirred water is 1 minute typical to 90%. This model sensor is attached to a 6.1m (20 ft) cable.