Boss TU-3 Chromatic Pedal Tuner The Boss TU-3 has arrived, carrying on and improving on everything that made the best-selling TU-2 great. Housed in a tank-tough Boss stompbox body, the TU-3 features a smooth 21-segment LED meter with a High-Brightness mode that cuts through the harshest outdoor glare. On the TU-3, choose between Chromatic or Guitar/Bass tuning modes, and enjoy visual pinpoint tuning verification with the Accu-Pitch Sign function. The Boss TU-3 incorporates a convenient Note Name Indicator that can display notes of 7-string guitars and 6-string basses, while the Flat-Tuning mode can support up to six half-steps. The Boss TU-3 is the new-standard tuner that no guitarist or bass player should be without. Features: • 21-segment LED meter with brightness control • High-Brightness mode enhances meter visibility outdoors • Accu-Pitch Sign function provides visual verification when tuning is complete • Chromatic and Guitar/Bass mode (tune by string number, with support for 7-string guitars and 6-string basses) • Flat tuning is supported with Guitar Flat mode, which allows for "drop" tunings up to six semitones below standard pitch • Signal is automatically muted when the tuner is on • Supplies power for up to 7 BOSS compact effect pedals • Tuning Range: • C0 (16.35Hz)-C8 (4186Hz) • Reference Pitch: A4=436-445 Hz (1Hz step) • Tuning Accuracy: +/-1 cent • Power Supply: DC 9 V: Dry battery 6F22 (9 V) type (carbon), Dry battery 6LR61 (9 V) type (alkaline), AC Adapto