High accuracy: the measurable temperature range: -20 C ~ + 60 C (-4 F ~ + 140 F), temperature measurement accuracy: 1.0 C, temperature resolution: 0.1 C. Measuring Humidity Range: 10%RH ~ 99%RH, Humidity Measurement Accuracy: 5%RH, Humidity Resolution: 1%RH The readings are updated every 10 seconds to give you the latest and more precise temperature and humidity values. Air comfort indicator: The indoor hygrometer has a comfort indicator that shows an unpleasant expression when the humidity is below 40% or above 74%, it shows a smiling face when the humidity is between 40% and 74%. Adjust the air conditioner, humidifier and heater to different expressions to bring the room to the optimal temperature. Easy to read: The larger font shows the current temperature and humidity. Even if the distance is far, you can read the measured value. Powered by CR2032 (including battery). The battery life is long. Easy to install: humidity meters are available in different installation options, it can be placed on a table or bookshelf, or attached to the wall with wall stickers. The small and compact size is enough to take it with you to save space. Widely used: the mini LCD digital thermometer thermohygrometer is very popular and can be used in a variety of applications in homes, baby rooms, offices, cars, schools, wine cellars, laboratories, greenhouses, aquacultures, instrument shops, libraries, warehouses.