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Digital Hygrometers. Digital hygrometer sense humidity by means of non-moving sensors whose electrical resistance is affected by moisture. The Weather Store offers a great selection of fine digital hygrometers for precisely measuring humidity. Digital hygrometers offer memory for high and low readings, don't fall out of calibration, and offer very good accuracy.
Quick Answer. Hygrometers measure the amount of moisture or humidity in the air, but there are a number of different types of hygrometers, and they display their results in different ways. Most hygrometers display their readings in the amount of water in a given volume of air, making the units milliliters per cubic centimeter.