McKesson Digital Refrigerator / Freezer Thermometer with Alarm Fahrenheit / Celsius -58° to +158°F (-50° to +70°C) Glycol Bottle Probe / Internal Sensor Multiple Mounting Options Battery Operated (1074440_EA) 1/EATriple display 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). Monitors refrigerators or freezer temperatures from 40 to 158 F ( 40 to 70 C ) Audible alarm indicates when the programmable low and high limits set are breached. Optional