McKesson Datalogging Refrigerator / Freezer Thermometer with Alarm Fahrenheit / Celsius -58° to +158°F (-50° to +70°C) 2 Glycol Bottle Probes / Internal Sensor Flip-out Stand Battery Operated (1074442_EA) 1/EADisplay shows current, min max temperatures with a 10 second refresh rate, accuracy of 0. 5 C and a 0. 1 display resolution Certified, serialized and traceable and has been tested against a standard, calibrated at the National Institute of Standards and Technology (NIST) Waterproof, external bottle probe with 2000 mm cable monitors refrigerators or freezer temperatures from 22 to 158 F ( 30 70 C) Includes internal sensor to measure room temperatures