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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.
What is a Hygrometer. When looking for a weather meter that measures relative humidity, you may find yourself asking âwhat is a hygrometer?â The true hygrometer definition is an instrument which measures the water vapor of the atmosphere. This is also referred to as the ârelative humidityâ in the environment. All weather meters that measure relative humidity are also known as hygrometers. All Kestrel Meters from the 3000 series an up measure relative humidity, so are therefore classified as Kestrel hygrometers.