Many common problems with acoustic guitars are due to humidity. Keep your investment protected with the Oasis Guitar Humidifier and Hygrometer Combo Pack. Have you ever noticed that the tonality of your guitar can change season to season? Or that the string action changes? This can be due to humidity issues. Too little humidity can cause slight changes or even massive damage to your guitar. Ever see an acoustic where the top has started to split? There's a good chance it was due to humidity. The Oasis Guitar Humidifier and Hygrometer Combo Pack lets you rest at ease knowing your guitar is safe and protected. The Oasis Guitar Humidifier is made from a special fabric that allows water vapor, but not water, to pass through it. As more humidity is needed, the Humigel crystals release it, creating a vacuum that shrinks the humidifier and letting you see when it needs to be refilled. The Oasis Guitar Humidifier hangs down from your guitar strings, thanks to a polyurethane stabilizing bar that lies across your strings. This ensures that the Oasis Guitar Humidifier won't touch the back or sides of the guitar, potentially causing damage. To accurately monitor the conditions in your guitar case, use the Oasis Digital Hygrometer. Just leave it in your case and you'll instantly know what the average humidity is. It also shows you the low/high temperature extremes, so you'll always know what your guitar's environment is. You love your acoustic guitar, so keep it at peak condition with the Oasis Humidifier and Hygrometer Combo Pack!