McKesson Refrigerator / Freezer Thermometer, Digital Display, -58° to +158°F (-50° to +70°C), 1/EAPRODUCT FEATURES: Triple 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 158F ( 40 70 C ) Audible alarm indicates when the programmable low and high limits set are breached