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This is the best ukulele humidifier that we have come across so far. It is specifically designed to fit the body and soundhole of the uke, and is designed to put out slightly less humidity than the Oasis guitar system does to accomodate the smaller instrument. 

It is very easy to use, and you can check the water level just by looking at it.  "Humigel" particles inside thicken the water to guard against the possibility of spillage.  The Oasis Ukulele Humidifier comes with a small water injector to add water, as well as the humidifier and string clip.