This mini digital thermometer is used for measuring the indoor temperature of refrigerator and out temperature by using the waterproof outer sensor. Small size and light weight, very easy to use. With a hanging hole to be hung on the wall, magnetic attachment to attach on the metal surface and a bracket to be placed on the table. Features: Digital LCD display, high accuracy and stability. Waterproof outer sensor with high/low temperature alarm setting. Large display for indoor and outer sensor temperature. Switchable temperature units of Celsius() or Fahrenheit(). Maximum / minimum temperature memory. Can be used for refrigerator, freezer, medical box, fish tank, etc. Specifications: Brand Name: Vici Color: Black + Blue Material: ABS Plastic Display: LCD Display Screen Size: 48 * 20mm / 1.89 * 0.79in Room Temperature Range: -10 50 / 14 122 Outer Sensor Temperature Range: -50 70 / -58 158 Resolution: 0.1 / 0.1 Accuracy: 1 / 1.8 Sampling Rate: about 10 seconds Sensor Cable Length: Approx. 3 meters / 9.84ft Power Supply: 1 * 1.5V AAA Battery (Not Included) Working Temperature/Humidity: 050,