INTELLIGENT DIGITAL THERMOMETER HYGROMETER The mini digital hygrometer has 2 icons. When the humidity is between 40% and 70%, it displays a smiling face. When the humidity is lower than 40% or higher than 70%, it displays dissatisfaction, making it easy to keep your home healthy and comfortable.TEMPERATURE MEASURING RANGE: Temperature measuring range: -10~70C. Temperature measurement accuracy: 1. The measurement conditions are updated every 10 seconds. (There may be a difference of 1/% between two thermometers, but it is normal.)ACCURATE HUMIDITY MEASUREMENT: Indoor/outdoor humidity measuring range: 10%RH-99%RH. Humidity measurement deviation accuracy: 5%RH. .SMALL BUT LONG BATTERY LIFE This hygrometer thermometer (4.3 x 4.3 x 1.3 cm, weighs only 21 grams) is small, durable, and portable, enough to save space and carry with you. Powered by CR2032 (including battery), the battery life is up to 12 months.