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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.
Continue Reading. A humidor is any container designed to store cigars, cigarettes, or pipe tobacco at the ideal level of humidity, which is 68 to 75 percent. They can be made of wood, glass, pottery, metal, or plastics and come in a wide range of sizes.