German HYGROMETER 42 mm

German Hygrometer 42 mm diameter.
Ideal to keep inside the case. Verifies the level of humidity. It is essential to ensure that the instrument is kept under the right humidity level to avoid damage to the woods.
Made in Germany

This hygrometer allows to be calibrated.

How to calibrate this hygrometer:
For calibration, wrap the hygrometer for 30 minutes in a damp cloth.
30 minutes later, we will check that the hygrometer needle shows between 94% and 96%.
Otherwise, we will adjust with a small flat screwdriver in the central hole of the back part until indicating 94-96% humidity.
Now we would have our hygrometer calibrated, we just have to let a few minutes pass until the needle shows the correct humidity percentage.