The D’Addario Humidifier Pro, for guitars and now ukuleles, uses a specialized hydrophilic sponge that holds 12 times its dry weight in water (much
more than ordinary sponges), which allows for longer periods between refills and increases protection in drier environments.
Preserve your instrument’s ultimate playability by guarding against cracks, warped necks, and shrinkage is now easier and less work. Suspended by the strings, the
humidifier releases moisture evenly and slowly inside your instrument, yet never touches the instrument’s body. The humidifier’s stopper allows you
to check the sponge without removal of the unit and provides a tight seal when in place. Maintaining the humidifier is as easy as moistening the
sponge when it becomes dry.