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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.
Using a psychrometer to calibrate a hygrometer ensures the most accurate readings when it comes to determining relative humidity. Those who rely on accurate atmospheric readings for their jobs, including those work or train outdoors, typically utilize psychrometer technology as part of a handheld weather meter device that is designed for use in the field.