Planet Waves Acoustic Guitar Humidifier

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Planet Waves' Humidifier protects your guitar even in the driest conditions.  Suspended by the strings inside the guitar body, the humidifier releases  moisture evenly & slowly inside your guitar, yet never touches the guitar's body.  The open-cell phenolic foam insert disperses moisture slower and more evenly than ordinary sponge and shrinks less than 1% when dry vs. sponge, which can deform dramatically.
The Humidifier is also equipped with a syringe, which allows you to control the amount of water used when filling or refilling the humidifier.  Maintaining the humidifier is as easy as squirting distilled water into the nozzle about once a month or when the element begins to dry.  The frequency of maintenance will vary considerably depending on your specific atmospheric conditions.
It's an excellent choice to keep your guitar in the best condition possible!