Here in Vermont the climate becomes severely dry in the winter. A student turned me onto these wonderful Oasis humidifiers. Lack of humidity causes terrible damage to guitars. My favorite feature of the oasis humidifier ($16.99) is you can see when the unit needs a refill (see the empty unit above). These oasis guitar humidifiers have rapidly replaced the cumbersome Damp-it brand guitar humidifier in my gig bag. The Dampit guitar humidifier is much messier, as it is difficult to keep from getting excess water in your guitar. The oasis guitar humidifier is a tidier unit and at ($16.99) I can afford to keep one in all of my guitar cases. Ed Eastridge While the original Blue Oasis humidifier ($16.99) provides sufficient humidity in many environments, it is not effective everywhere. The humidity demands of the desert, mountain states or frigid north exceed the humidification capacity of the device. For this reason, we have developed the Oasis Plus+ humidifier ($16.99) . The Plus+ is the same size and shape as the original blue Oasis humidifier, but is made of a different material which provides 50% more humidity output. Because the Oasis Plus+ humidifier ($16.99) is the same size as the original Blue Oasis® and it has 50% greater humidity output, it will be necessary to refill the Oasis® Plus+ more frequently than the original Blue Oasis®. If one is using a hygrometer, we recommend that the Oasis® Plus+ be used when the room humidity is below 25%. The original Blue Oasis humidifier ($16.99) should be used when the surrounding room humidity is between 25-40%. Above, 40%, you should not be using a humidifier. It is important to also to monitor the humidity inside your instrument case. Case size, design, material and other factors will impact the humidity permeability of each case. While general rules are helpful, a good hygrometer located inside the instrument case will give you the best information regarding proper humidification requirements. Oasis Plus+ Guitar Humidifier OH5$16.99 Oasis Humigel Crystal Replacement Kit $4.95 Oasis Case Humidifier $16.95 Oasis Digital Hygrometer/Thermometer $24.95 Oasis Guitar Humidifier $16.99 Wittner MT50 Metronome $18.95 Oasis OH11 clip on tuner Regular price: $16.95 Sale price: $14.95 Ergoplay guitar support $29.95