This is a pitch pipe (tuning fork) for a dragonfly. It allows for accurate tuning to A=440hz. It's portable and useful for tuning various instruments. It's perfect for checking pitch before performances in choral groups, a cappella, chorus groups, vocals, and shigin (Japanese chanting). It's also convenient for pitch recognition for string instruments, wind instruments, Western instruments, and Japanese instruments. In addition, it can of course be used as a guitar tuner. It has a full 13-note chromatic scale (semitones), and because it can be held in the mouth, you can use both hands to adjust the pitch while producing a sound. It's a reed instrument, so it has a tone similar to a harmonica. It has been disinfected by wiping it with a cloth containing hypochlorous acid. It will be shipped via Yu-Packet Post Mini.