Oasis Hygrometer Holder for Guitar Hygrometer Holder for Guitar The Oasis Hygrometer Holder was created to enable you to measure the humidity at the body of your guitar without risk of scratching the soundboard Accurate humidity measurement is only possible when the hygrometer is positioned near the area where the humidifier is located Guitar cases are designed with a cradle to support the neck of the guitar This is also where the supply/accessory box is located, which creates a humidity barrier