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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.
Measuring the Accuracy of your Hygrometer. 1  1. The simplest way to test a Hygrometer for accuracy is the damp cloth test. Simply wrap a damp cloth around it and leave it for a few hours. 2  2. A more accurate way to measure hygrometer accuracy (or to help calibrate accuracy) is the Salt Test..