The world’s top-selling stage tuner, the BOSS TU-2, evolves and improves with the debut of the new TU-3. 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. Choose between Chromatic or Guitar/Bass tuning modes, and enjoy visual pinpoint tuning verification with the Accu-Pitch Sign function. The 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. It’s the new-standard tuner that no guitarist or bass player should be without!

21-segment LED meter with brightness control

High-Brightness mode enhances meter visibility outdoors

Accurate to +/- one cent

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

Tuner automatically mutes when the tuner is on

Supplies power for up to seven BOSS compact effect pedals

BOSS five-year warranty

C0 (16.35Hz)–C8 (4186Hz)

A4=436–445 Hz (1Hz step)

±1 cent

DC 9 V: Dry battery 6F22 (9 V) type (carbon), Dry battery 6LR61 (9 V) type (alkaline), AC Adaptor (PSA series: optional)

30 mA (DC 9 V), 85 mA (DC 9 V, when High Brightness mode is on)

Owner’s Manual, Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTES,” and “Information”), Dry battery/9 V type (6F22)

AC adaptor: PSA series, Parallel DC cord: PCS-20A