Keep your acoustic guitar at the right humidity level with a compact, easy to use humidifier and indicator built into one unit. Key benefits Prevents instruments from drying out by providing controlled, insitu humidification while you monitor humidity in real time. Simple to use and fast to install without removing or loosening strings. Pocketable and lightweight for easy transport between home, rehearsal, and gigs. Features 2in1 design combines an indicating needle humidiometer and a humidifier for simultaneous humidity measurement and delivery. Two fill inlets, each holds 5 ml of water; refill using a small refillable bottle for quick ups. Clamps directly on the sound hole of an acoustic guitar for direct humidification into the instrument body. No battery required for the analog indicating needle, so no power maintenance. Constructed from ABS and plastic for long service life, with a gold detection hygrometer head and black ABS plastic humidifier body. No need to move strings during installation; fits quickly and can be removed and stored in a pocket. How to use Fill each of the two inlets with 5 ml of water using a refillable bottle. Clamp the unit over the sound hole so it sits securely without loosening strings. Read the indicating needle to monitor relative humidity while the unit slowly humidifies the instrument. Practical applications Home storage: place the humidifier in the sound hole when indoor air becomes dry, especially during heating seasons. Travel and rehearsals: carry in your case or pocket and install quickly at venues to maintain consistent humidity on the road. Instrument maintenance between sessions: use during short storage periods or overnight to stabilize humidity levels. Compatibility and performance Designed for use with acoustic guitars and other hollow body stringed instruments with a standard sound hole where the clamp can be applied. Provides simultaneous measurement and humidification for real time control of the instrument environment. Durable ABS and plastic construction with a reliable indicating needle hygrometer head for long term use.