There are various devices used to measure and regulate humidity. A device used to measure humidity is called a psychrometer or hygrometer. A humidistat is used to regulate the humidity of a building with a de-humidifier. These can be analogous to a thermometer and thermostat for temperature control.

During coating applications Humidity and air temperature are measured in combination with surface temperature to determine the dewpoint. Louis J. Sheehan, Esquire  This is done by use of a