Original Digital Thermo hygrometer HTC-2 Original Digital Thermo hygrometer HTC-2 Details Model Number HTC-2 Model Name Hygrometer Material ABS Plastic Luxury Clock Yes Suitable For The hygrometer is the amount of water vapor in the air. Above 50%, the air is too humid, the air charged with water vapor condenses on cold surfaces (window frame wallpaper), creating an environment conducive to the proliferation of molds and mites, without forgetting the formaldehyde which diffuses more quickly in a humid air. A dehumidifier is necessary. Below 40%, air attacks the nasal mucous membranes and irritates the respiratory tract. Lack of ventilation, heating and air conditioning dry the air. Thus: it is common in winter, in homes too heated and unventilated, to see the humidity drop. A humidifier is needed Features Wire outdoor and indoor temperature (Fahrenheit or Celsius) Measures temperature and humidity level Includes clock, day, date and alarm function Provides for flip out bracket for free standing or wall fixing Batteries included Description A time piece that belongs to 21st century. This one shows time, temperature and humidity. You can also set alarms for your tasks economical way to monitor indoor temperature and humidity measures . Temperatures as low as -58Â degree Fahrenheit and up to +158Â degree Fahrenheit. Display features one-inch tall digital numbers. Powered by 1 x AA battery (not included displays temperature, humidity and time simultaneously ). If used outdoors, please place under protected area such as a covered porch.