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, Display: LCD Display Screen Size: 48 x 20mm / 1.89 x 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 x 1.5V AAA Battery (Not Included) Working Temperature/Humidity: 0~50℃, <80%RH Storage Temperature/Humidity: -10~60℃, <80%RH Item Size: Approx. 73 x 52 x 17mm / 2.87 x 2.05 x 0.67in Item Weight: 48g / 1.71oz TPM803