Vicks Hygrometer and thermometer Assess the humidity level Maintains humidity levels between 40% and 60% Indicates the ambient temperature Indicates the relative humidity level The Vicks 2 in 1 hygrometer and thermometer is a device that measures the ambient temperature and humidity level of rooms to improve indoor comfort. Maintaining air humidity between 40 and 60% reduces the survival of influenza viruses in the air or on surfaces. When temperatures get cold, humidity levels drop. Cold air can't hold moisture as well as warm air. As a result, when we heat our homes, relative humidity (RH) levels can drop by up to 10%. The air is drier than that of the Sahara Desert, which can cause dry skin and nose and throat discomfort. Maintaining the humidity level between 40 and 60% can also provide relief to the throat and nose, eyes and skin and improve children's daily well-being.