BOSS Compact TU-3S Tuner Space-saving design, high-brightness mode.

The tuning functions of the highly acclaimed TU-3 have been condensed into a compact size. The 21-segment LED meter ensures high visibility. It features a high-brightness mode, making it suitable for outdoor use. The AccuPitch function visually indicates when tuning is complete. It features chromatic mode and guitar/bass mode, and is compatible with 7-string guitars and 6-string basses. Guitar Flat mode supports tunings from standard pitch down to drop tuning (6 semitones lower). Powered by an optional PSA adapter. The DC output jack allows power to be distributed to BOSS compact effect pedals using the optional PCS-20A. Peace of mind with a long-term 5-year warranty.