BOSS TU-3 Chromatic Tuner This is the BOSS TU-3 chromatic tuner, offering high-precision tuning. 1. "High Brightness Mode" operation confirmed The TU-3 is equipped with a "High Brightness Mode" that is easy to see outdoors. Switching is also working without any problems. 2. DC Outlet confirmed The TU-3 has a function that can supply power to other effectors. The terminals in this part are also clean. Serial Number: B3D4789 - Model: TU-3 - Type: Chromatic Tuner - Output: OUTPUT - Input: INPUT - Bypass: BYPASS Thank you for viewing.