Several of us are away at the Somerset Folk Harp Festival, and we may not be able to respond to emails and phone calls as quickly as usual. Thank you for your patience!
The Caliber IV hygrometer is a great tool for monitoring the humidity and temperature in the room where your instrument is kept, or inside the case with the instrument. Extremes of humidity or dryness can be dangerous to musical instruments, and knowing the humidity allows you to decide if humidification or dehumidification is necessary in your environment.
Features
See this blog post for more information on humidity and dryness.