It is a dual meter that monitors temperature and humidity. The indoor measuring range is 0 to 50 degrees Celsius, and 32 to 122 degree Fahrenheit. Humidity is measured from 25% to 98%. Min/Max button displays the high and lows and the reset button provides control over the cycle period. Has a remote probe on a long cord to monitor two areas, or the inside and outside of your garden area. Wall mountable, or freestanding. Requires one AA battery. (included)