A guitar humidifier designed to protect acoustic guitars from damage caused by dry conditions. It sits in the guitar's sound hole and releases moisture to maintain proper humidity levels inside the case.

Key Features:

• Included hygrometer: The OH-2 Digital Hygrometer monitors humidity levels either in the room or inside your guitar case

• Automatic operation: Releases moisture as needed — no guesswork required

• Easy refill: Uses distilled water; customers say once-a-week refills are typical

• Compact size: 4 x 4 x 6 inches, weighing just 0.8 oz

• Includes battery: Ready to use out of the box

What customers say:

• Effectively maintains case humidity around 45–55% even when room humidity drops to 30% or below

• Described as a "must-have" for quality acoustic instruments, especially during dry winter months

• Easy to read and use; considered one of the simplest humidifiers on the market

• Note: may not fit well in shallow instruments like ukuleles