(Clear 3.9 Inch LCD Humidity Monitor)Room thermometer indoor features a 3.9 inches LCD display with large bold numbers and easy to read even from a distance. Portable digital thermometer hygrometer is not only lightweight and compact, but also easy to put in your pocket and put it anywhere in your home or carry to the outdoors(Wide Temp & Humid Range) Temperature range (-4~158F,-20 ~ 70); Humidity range (10% ~ 99%). The temperature and humidity accuracy: 1.8/ 1 / 5%, Data will update every 10s automatically to give you last changes of the environment. The digital thermometer hygrometer has a memory function that remembers the maximum and minimum temperature and humidity values for each day and clear the data at 0:00 each day(3-level air comfort indicator)Three cartoon symbols alert you to the comfort level of the air around you, displayed as "CONFORT/DRY/WET", WET: humidity 60%; COMFORT: 30% humidity 60%; DRY: humidity 30%. Ensure proper humidity levels and monitor your family's living conditions and health(3 Mounting Methods)Desktop, wall-mounted and magnetic design for easy placement wherever you need it, suitable for kitchen, bedroom, baby room, office, classroom, warehouse, etc. The product requires 2 AAA batteries (not included). When the low battery icon is displayed, you need new batteries for the sensor