BOSS Chromatic Tuner TU-3 Boss Chromatic Tuner Selling to organize my equipment. Operation confirmed. Please be aware that this is a used item. A genuine BOSS AC adapter is also included. ＜Description＞ ● The successor to the TU-2, which built an era as a super standard. ● Newly equipped with "High Brightness Mode" to further improve visibility outdoors, and smooth meter display with 21 LEDs. Convenient features such as support for flat tuning up to 6 semitones allow for comfortable tuning.