Tombo P-13A Chromatic Tuning Whistle, Tuning Whistle, A Scale, For Japanese Instruments

The dragonfly whistle is carefully tuned to suit each and every use of the long production technology of reed musical instruments.Best of all, its portable and easy to use when you are tuning each instrument.While you ring the tune whistle, rotate the screw of the string you want to match, and adjust the sound to match both sounds.