The TU-3 Chromatic Tuner from BOSS is an effect-type pedal tuner that features a smooth 21-segment LED meter with a High-Brightness mode to cut through the harshest outdoor glare. It can be used to accurately tune electric and bass guitars in various environments for applications such as live stage, theater, rehearsals, and more.
The TU-3 has Chromatic or Guitar/Bass tuning modes and features Accu-Pitch with visual-pinpoint tuning verification. It also incorporates a 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.
Finally, the TU-3 is powered by the included 9V battery. It can also power up to seven Boss compact pedals when using the optional AC adapter (sold separately). This is a tuner that no guitar or bass player should be without.