Smart Design: Quartz precision and waterproof material make it very convenient to use. Lightweight and small, it won't take up much room in your fridge. Large numbers, ideal for people with poor eyesight. You can easily read the display thanks to the large bold numbers. Easy to Use: No complicated controls, it's the simplest electronic thermometer with only two buttons. Press the On/Off button to turn on the thermometer, then select Degrees or Fahrenheit. Measurement range: -20~50 Measurement error: 1 Refresh rate: 10S Working principle: Thermistor converts temperature display Battery model: CR2032 button battery *1PCS (included) Wide range of Applications: The perfect thermometer for refrigerators, room temperature meters. It is suitable for different occasions such as home, restaurant, bar, cafe. It is also a great gift for family or friends.