DUAL TEMPERATURE MONITORING: This Freezer Thermometer accurately monitors temperature inside an appliance as well as Room temperature. The Hi-Lo Memory feature remembers the highest and lowest temps reached at both locations. The large LCD reports the appliance temp continuously, and toggles to Room temp on demand. COMMERCIAL APPLICATIONS: The Digital Refrigerator/Freezer Thermometer with Alarm monitors temperature inside freezers, refrigerators, reach-ins, walk-ins, coolers, , warming stations, dishwashers and many other temperature-critical appliances and alerts with an urgent, audible alarm whenever temperature is out of range. PROGRAMMABLE ALARM: You can program both high and low temperature setpoints to accurately define the temperature range important to your application. The loud, audible alarm beeps urgently four seconds per minute whenever temp is out of range-quickly alerting you to potential trouble. EASY INSTALLATION: The display unit features a magnetic back for quick mounting to any metal . Double-stick tape and hook-and-loop strips (included) offer additional mounting options. The tiny remote probe tucks easily and inconspicuously out of the way. The probe cable is ultra-thin, threading smoothly under or between door gaskets. BATTERY POWERED: This Refrigerator Thermometer is powered by a single AAA battery (included) that is user-replaceable. The battery compartment is accessed conveniently from the front of the display, eliminating the need to demount the unit for battery changes.