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Use of hygrometer

The traditional hygrometer is shown by the hair induction test, and the error will be relatively large. The hygrometer has been tested and calibrated before shipment. It does not need to be calibrated after receipt. It can be fixed in the corresponding position. For example, the hygrometer is not sensitive or the pointer will not move. Blow the hair dryer for about 2 minutes or wrap it with a clean cloth for 5 minutes to test. If the pointer scale changes, the hygrometer can be used normally.