Temperature Humidity Meter, Thermistor, Number of Channels 3, Includes NIST-Traceable Certificate Yes, Accuracy +/-0.3 Degrees F or +/-0.5 Percent of Reading Whichever is Greater, -40 Degrees to 300 Degrees F/ -40 to 150 Degrees C, (1) 9V, 7/8 in H x 2 in W Display with 4-Digit Backlit LCD, Functions Degrees F/ Degrees C Switchable, Constant Scan Feature, Min/Max Memory, 10 Percent to 95 Percent, Resolution 0.1 Degrees /1 Percent RH