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.


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 Adaptor (PSA series: optional)

Current Draw

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

Width:-73 mm - 2-7/8 inches
Depth:-129 mm - 5-1/8 inches
Height:-59 mm - 2-3/8 inches
Weight:- 390 g - 0 lbs. 14 oz.