Comfort Level Indicator: The indoor thermometer features three smiley icons that simultaneously display different temperature and humidity levels, allowing you to monitor your health and comfort at home: humid, comfortable, dry, at a glance. Accurate and Fast Response: The indoor air thermometer allows air to flow through ventilation openings, providing fast and accurate readings. It measures temperatures from -50 to 70 degrees Celsius and humidity from 10 to 99 percent relative humidity, allowing you to adjust your heating or humidifier based on the temperature and humidity readings. Easy to Read: The large, clear digits on the desktop indoor hygrometer are easy to read on the LCD screen. It also has a stand, a magnetic mount, and a mounting slot on the back, allowing you to place it virtually anywhere. You can switch between Celsius and Fahrenheit display at will; the indoor thermometer makes your indoor temperature and humidity readings clear at a glance. Low Power Consumption: Thanks to its low-energy display, the room thermometer can operate for at least 18 months; the combined humidity display and air comfort indicator keep you informed of both the room's humidity level and temperature simultaneously. Fast Update: The digital indoor thermometer updates every 10 seconds to keep you up-to-date on the latest temperature and humidity readings.