Protect frozen and chilled samples from potential spoilage. Monitor temperatures inside your freezer or refrigerator with the added convenience of sound and flashing LED lights to alert out-of-range temperatures. Suction cup attaches the probe inside freezer/refrigerator while the thermometer secures to the outside with hook-and loop tape Large digital display shows freezer/refrigerator temperature plus ambient temperature Set freezer range: 14.9° to -9.4°F (-9.5° to -23°C); set refrigerator range: 35.6° to 46.4°F (2° to 8°C) Switches toggle for freezer or refrigerator monitoring and °F or °C Includes one AAA battery Unit measures 136 x 19 x 28 mm; probe cable measures 0.9 m; probe measures 5 mm OD x 17 mm