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. 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. 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 . 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. color: White Material: ABS plastic RUGGED CONTRUCTION: This Digital Refrigerator Thermometer is constructed of tough ABS, cleanable with a damp cloth. The external probe and cable are waterproof- to withstand continuous immersion in water, freezing in ice or contact with soil. Package Contents: 2 x ermometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.