I have a Takamine gs 330s acoustic guitar, which sells new at Guitar Center for $330. My grandpa gave me a "Planet Waves" acoustic guitar humidifier. I do not want my guitar to become warpedor messed up because of the lack of humidity, and I am starting to doubt the effectiveness of the "Planet Waves" humidifier. Here is my home made guitar humidifier. Soon I am making one for my Lanikai LU-11 ukulele.