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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.
Hygrometers are used anywhere it is important to monitor the moisture content of a space. Greenhouses, for example, use hygrometers to ensure plants have the correct level of moisture in the air for proper growth. Warehouses use hygrometers to ensure their products will not become damaged by high moisture levels.