The Oasis OH-18 Ukulele Humidifier is the same size as the OH-1 humidifier, but it has a special hanger which allows the humidifier to hang at an angle from the strings inside the ukulele soundhole. Because the ukulele is a smaller instrument, it needs less supplemental humidification than a guitar. The humidity reduction was accomplished by modifying the liner for the OH-18 ukulele humidifier. The OH-18 ukulele humidifier comes with the special ukulele stabilizer and a 10 cc syringe for increased distilled water filling control.