A plastic simulated Brass hygrometer gauge that can be fitted to a wall or inside your piano with ether a screw or sticky pad (not supplied) it gives a reading of air humidity levels. A marker line indicates the maximum and minimum humidity recommended for your piano.
This is a must buy if you need to monitor the humidity of the room where your piano is located or can be placed inside the piano using .
Hight 15mm Diameter 45mm
If you are having a problem with swings in humidity you can contact your local piano tuner and ask about fitting a Piano Life Saver.