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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.
Improvements to the Michel Instruments MDM300 dew point hygrometer enable it to measure the dew point of drying air down to -70 degC in less than 10 minutes. The new station has a digital thermometer, rain gauge, barometer, wind vane, anemometer and hygrometer.