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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.
A hygrometer is weather instrument used to measure the amount of humidity in the atmosphere. There are two main types of hygrometers â a dry and wet bulb psychrometer and a mechanical hygrometer. What is Humidity? Humidity is the amount of water vapor in the atmosphere caused by condensation and evaporation. It can be measured as absolute humidity (the amount of water vapor in a unit volume of air), or as relative humidity (the ratio of moisture in the atmosphere to the maximum moisture the atmosphere can hold). 1  It is what gives you that horrible sticky feeling on a hot day and can cause heat stroke.