Flanger Acoustic Guitar Humidifier Maintenance Tool, Sandhole Humidifier (White)

Compatible with soundhole diameters of 99mm to 102mm. Built-in hygrometer allows you to monitor the humidity inside your acoustic guitar. Soft rubber covers the contact surface with the guitar, so it won't damage your guitar. Note: If your guitar has a lacquer finish, please refrain from using this product as it may damage the finish. Its compact size and lightweight design allow you to carry it anywhere in your guitar bag or case.