Dampit instrument humidifiers are designed to fit inside your instrument, where it slowly releases moisture to create the proper humidity. (Although we suggest just placing it inside your case.) Regular use of Dampit will protect your instrument from cracking and keep the pads form drying out. Includes a paper humidity indicator. If you wish to monitor the humidity we suggest using a gauge instead of the paper indicator. Try our dial or Planet Waves digital gauge for best results.Select 1st or 2nd joints below.