Temperature and humidity are two important factors in maintaining optimal comfort levels and good indoor air quality. Quickly and conveniently take accurate humidity and temperature readings with the 971. Invaluable for facility maintenance and utility technicians, HVAC-service contractors, and specialists who assess indoor air quality (IAQ). Specification: Temperature: -20C to 60C (-4F to 140F) Temperature accuracy 0C to 45C (0.5C) -20C to 0C & 45C to 60C (1.0C) 32F to 113F (1.0F) -4F to 32F & 113F to 140F (2.0F) Resolution: 0.1C / 0.1F Temperature Update Rate: 500 ms Temperature Sensor Type: NTC Relative Humidity Range: 5% to 95% RH Relative Humidity Accuracy 10% to 90%RH @ 23 C (73.4F) (2.5%RH) ( 90%RH @23C (73.4F) (5.0%RH)