1. [3 Air Comfort Level Indicator]This Digital thermometer with 3 level icons indicate air conditions-WET/OK/DRY. The indoor hygrometer thermometer measures home humidity and temperature in time and helps to adjust the humidifier, dehumidifier and humidistat. Make sure the family's living condition and that always live in the optimal environment with our humidity meter and temperature gauge. 2. [High Accuracy and Fast Refresh]This indoor thermometer for home has wide measuring range that measures temperature from -4.0℉ to 158.0℉(-20℃~70.0℃) and humidity sensor measures humidity from 10% to 99%RH. The temperature monitor has high accuracy of ±5%RH and ±1.8°F; Data measurements are updated every 10 seconds to give you latest changes of the environment. 3. [Pocket Size & Easy to Read]This small and lightweight digital hygrometer are easy to carry. Especially uses as an room thermometer in the bedroom, room, office, greenhouse, camera drying box, cellar, etc. The large LCD display with thick and big numbers allows you to read the temperature and humidity more easily and clearly. 4. [Multiple Mounting Options]There are three mount methods for our temperature and humidity monitor, such as wall mount, magnet attachment and table stand, put anywhere you want; °F/°C Selector are on the back; The room thermometer indoor requires 2 x AAA battery which working around 12 months, (not included, the battery slot is on the back, and you need to slide the magnet cover to put the battery in.)