The Dampit Acoustic Guitar Soundhole Humidifier brings easy-to-use acoustic humidification to your fingertips thanks to a streamlined collared design intended to be placed in sound hole of your instrument without fear of falling in or moving. One of the oldest, tried-and-true designs for a humidifier on the market, the Dampit keeps your guitar at a constant relative 45-55% humidity to ensure years of perfect tone.