Item #0112012 Model #TU-3

BOSS TU-3 Chromatic Tuner Pedal Standard


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Provides easy-to-read tuning with a display made to be visible in dark or bright conditions.

The BOSS TU-3 Chromatic Pedal Tuner is a must-have for any serious guitarist. This legendary tuner evolves and improves on the world's best-selling TU-2 stage tuner, now with a high-brightness 21-segment LED meter that cuts through the glare of the spotlight. Choose between chromatic or guitar/bass modes to precisely tune your 6- or 7-string guitar or bass. The TU-3 supports dropped tunings up to six semitones below standard pitch. With visual pinpoint tuning verification provided by the Accu-Pitch function, you'll always be in tune for your audience.

Housed in a BOSS stompbox body, the TU-3 is built to handle the rigors of touring. It's designed to work every night, stomp after stomp, with a rugged and roadworthy construction. The TU-3 also provides power for up to seven additional BOSS effect pedals, keeping your pedalboard neat. Always dependable, the TU-3 ensures you'll never go out of tune on stage.

The TU-3 features a high-brightness 21-segment LED meter, allowing for precise tuning even in direct sunlight or under harsh stage lighting. Select the High-Brightness mode for improved visibility in any environment. With its bold and brightly lit display, you'll always be able to quickly tune up, even on the sunniest summer festival stages.

The TU-3 provides pinpoint tuning accuracy to +/- 1 cent. Once you've tuned a string, the Accu-Pitch function gives you a visual confirmation that you've hit the correct pitch. With support for dropped tunings and the ability to mute the tuner, the TU-3 ensures that you'll always be in tune and ready to perform.

BOSS is synonymous with precision tuners and the TU-3 upholds this tradition of reliability and accuracy. As the latest evolution of the world's best-selling stage tuner, the TU-2, the TU-3 brings unparalleled performance and a bold style perfectly suited for any pedalboard. Experience legendary BOSS build quality and enjoy perfectly tuned tones for years to come with the TU-3 Chromatic Pedal Tuner.

  • Tuning Range: C0 (16.35Hz) -C8 (4,186Hz)
  • Reference Pitch: A4=436-445Hz (1Hz step)
  • Tuning Accuracy: ±1 cent
  • Power Supply: DC 9V: Dry battery 6F22 (9V) type (carbon), Dry battery 6LR61 (9V) type (alkaline), AC Adaptor
  • Current Draw: 30 mA (DC 9V), 85mA (DC 9V, when High Brightness mode is on)
  • Dimensions
    • Width: 2-7/8"
    • Depth: 5-1/8"
    • Height: 2-3/8"
    • Weight: 14 oz.


  • 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 6 semitones below standard pitch
  • Signal is automatically muted when the tuner is on
  • Supplies power for up to seven BOSS compact effect pedals (with optional PCS-20A cable, sold separately)
  • Accessories:
    • Owner's Manual
    • Leaflet ("USING THE UNIT SAFELY," "IMPORTANT NOTES," and "Information")
    • Dry battery/9V type (6F22)