1. Versatile Compatibility: This moisture reservoir dehumidifier is suitable for both acoustic and folk guitars, ensuring that musicians of various styles can keep their instruments in optimal condition. 2. Humidity Monitoring: Designed with an integrated hygrometer, this guitar humidifier allows you to accurately monitor and maintain the perfect humidity level for your guitar, preventing damage and maintaining sound quality. 3. Material: Constructed from high-quality ABS material, this acoustic guitar sound hole cover humidifier is exceptionally sturdy and , providing long-lasting protection and care for your valuable instrument. 4. Instrument Care: As a specialized guitar protection product, the musical instruments humidifier helps prevent issues like dryness and cracking, ensuring your guitar remains in excellent playing condition and prolonging its lifespan. 5. Compact Portability: The acoustic guitar humidifier's small and portable design makes it incredibly convenient to carry around, allowing you to easily maintain your guitar's humidity levels whether you're at home, in the studio, or on the road. Suitable for guitar sound hole size 99-102MM Color: Black Material: ABS Package Contents: 1 x guitar humidifiers