Vicks Hygrometer and Thermometer 2 in 1 is a very reliable device which measures room humidity and temperature for better indoor comfort. Indeed, maintaining air humidity between 40-60% reduces the survival of flu viruses on surfaces and in the air.As cold temperatures set in, humidity levels drop. Cold air is unable to hold as much moisture as warm air. Because of this, when we heat our home the relative humidity level can drop to as low ad 10%. This is drier than the Sahara Desert, and can contribute to drier skin, as well as nose and throat discomfort.A comfortable humidity level between 40-60% can relieve your nose, throat, eyes and skin, and help you children to feel more comfortable.