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Stripped down to their most basic function, hygrometers measure the amount of moisture in the air using a metric known as relative humidity, or RH, expressed as a percent. Digital units come in a variety of shapes and sizes, from flat to round, and some even include a digital thermometer.
A hygrometer is weather instrument used to measure the amount of humidity in the atmosphere. There are two main types of hygrometers â a dry and wet bulb psychrometer and a mechanical hygrometer. What is Humidity? Humidity is the amount of water vapor in the atmosphere caused by condensation and evaporation. It can be measured as absolute humidity (the amount of water vapor in a unit volume of air), or as relative humidity (the ratio of moisture in the atmosphere to the maximum moisture the atmosphere can hold). 1  It is what gives you that horrible sticky feeling on a hot day and can cause heat stroke.