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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.
Humidors of all sizes use hygrometers to keep track of the humidity levels. Classification of humidors Walk-in humidor Most common in cigar bars or stores. One room is built as or converted to a humidor where all the cigars are stored. Cabinet humidor Usually placed on the floor as a piece of furniture.