GHD-01 is a humidifier specially designed for guitar, humidifying your guitar precisely and preventing it from shrinking or cracking. Most of the guitar humidifiers on the market now are placed between guitar strings, so the neck is taking an additional tension during the period of humidifying. To solve this problem, we designed GHD-01, an ingenious way to place a humidifier on the guitar without spreading the strings. Moreover, GHD-01 has an indicating needle, indicating the humidity for guitar in real time. Features: With an indicating needle, precise and durable. High quality sponge ensures humidifying evenly. Flexible plastic at the touch points of guitars protects your guitar against damage. User-friendly, convenient to maintain. Suitable for folk guitar, classical guitar, all acoustic guitars. Specifications: Model: GHD-01 Color: Black Compatible Device: For folk guitar, classical guitar, all acoustic guitars Item Size: 8.7 * 5.4 * 3.9cm / 3.4 * 2.1 * 1.5inch Item Weight: 40g / 1.4oz Package Size: 10 * 8.4 * 7.3cm / 3.9 * 3.3 * 2.9inch Package Weight: 71g / 2.5oz Packing List: 1 * Guitar Humidifier 1 * 10mL Dropping Bottle