With this measuring instrument, you can determine the wood humidity set in a room. The two indicators show temperature and relative air humidity. The intersection of the indicators determines the anticipated wood balance humidity. This value is decisive for the swelling and shrinking of the wood. The measuring instrument is used to monitor the drying of wood or to check the room climate in workshops, storerooms and new buildings with regard to the wood humidity. This is the only way to guarantee gentle drying or the right wood humidity for using the wood.