McKesson Digital Refrigerator / Freezer Thermometer with Alarm Fahrenheit / Celsius -58° to +158°F (-50° to +70°C) Desk / Wall / Door Mount Battery Operated (1074439_EA) 1/EADual channel measurement 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) External probe monitors refrigerators or freezer temperatures from 40 to 158 F ( 40 70 C ). Alarm display with real time and date stamp, low high limit settings, with visual, flashing LED light and