Ensuring proper indoor humidity has important skin, allergen, and other health benefits by inhibiting the growth of mold, bacteria, viruses, fungi, mites and other asthma inducing agents. The AcuRite Digital Temperature & Humidity Monitor allows you to check comfort conditions at a glance with this indoor humidity gauge and thermometer combination. This monitor features indoor temperature and humidity sensor. The humidity sensor expresses relative humidity. The home comfort monitor records the indoor temperatures and humidity using its daily high/low memory. The at-a-glance comfort icon shows either low, high or OK humidity level to know at a glance the humidity reading in your home. On the back of the unit, an integrated magnet allows the monitor to be placed on a refrigerator door or any other magnetic surface to allow for quick setup. Records temperature in either Celsius or Fahrenheit has a temperature range from 32-Degree Fahrenheit to 122-Degree Fahrenheit (0-Degree Celsius to 50-Degree Celsius) and a Humidity range from 20-95-percent RH. Requires one AA battery (not included). Country of origin: China.