The Dwyer DRFT-10-BLACK Solar Digital Refrigerator and Freezer Thermometer accurately monitors air temperatures inside your cooler, freezer, wine cabinet, thermidor, laboratory enclosures or any interior The DRFT-10 thermometer continuously reports temperatures in °F or °C with the flip of a switch. The DRFT solar-powered digital thermometer monitors appliance temperature fluctuations to preserve and prevent spoilage of food, medications, wines, and much more. The Dwyer DRFT-10 and DRFT-10-BLACK thermometers are powered by integral solar panels that make the unit environmentally attractive, efficient and cost-saving. AAA battery back-up insures accurate temperature reports in fluctuating light conditions. The ABS housing insures long service life under every-day use in residential, commercial, industrial and laboratory conditions. DWYER DRFT-10 SOLAR-POWERED THERMOMETER SPECIFICATIONS: Temperature Range: -40 to 158°F (-40 to 70°C). Accuracy: 0 to 50°C: ±1C; -40 to 0°C and 51 to 70°C: ±1.5°C. Operating Temperature Range: 41 to 140°F (5 to 60°C). Display: LCD. Dimensions: 4.5 x 1.1 x 0.6 in. Response Time: 10 seconds. Sensor: Thermistor. Power Requirements: 1.5 V AAA alkaline battery, installed functional, user replaceable. Case: ABS. Capillary Length: 3.2 ft (1 m). Weight: 2.8 oz (80 g).