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The hygrometer (see example below) measures how moist the air is at a certain location. This is also called relative humidity.
It can measure the humudity from 0 % (completly dry) to 100% (very humid). The scale on the hygrometer is divided into intervals of 1% (short marks) and 5% (long marks). The mark closest to the pointer is the current humidity. In the example above the humidity is 50%.