Measure temperature in air, water, or soil with the 6.1m (20 ft) TMC20-HD temperature sensor. This product is designed to be used with HOBO U-Series external-channel data loggers and ZW series wireless datanodes. This sensor records temperatures between -40° and 50°C (-40° to 122°F) in water or soil, and between -40° and 100°C (-40° to 212°F) in air. This product provides a response time of minutes typical to 90% in air moving 1 m/sec (2.2 mph); and 1 minute typical to 90% response time in stirred water. Please note, accuracy and resolution depend on data logger.