Description 1. High Accuracy and Fast Refresh: Upgraded digital hygrometer with sensitive probe sensor. Temperature measurement range: -10+60 (-14 F~ +140 F), error: +/-1 (1.8); Humidity measurement range: 10%RH~99%RH, error: +/-5%RH. Data measurements are updated every 10 seconds to give you lastest changes of the environment 2. Face Icon Comfort Indicator: Digital hygrometer with humidity level icon indicates air condition - dry/comfort/wet to notify you to adjust humidifiers, dehumidifiers and thermostats in time to ensure you are always living in the most comfortable environment . Two temperature display modes, press the / button to switch the temperature display to or 3. 4 Mounting Options and Wide Applications: Room thermometer digital hygrometer with desktop stand, wall sticker and hanging hole design, easy to place anywhere: bathroom, living room, kitchen, basement, garden, greenhouse, closet, cellar , guitar, humidor, refrigerator 4. Unique LCD Circular Display and : The digital hygrometer works right out of the box without complicated function buttons. The clear LCD display with large numbers makes it easy to read even from a distance. It is equipped with CR2032 button battery, which can be used for more than 36 months. If the battery of the room thermometer you received is insufficient, Please let us know