Boss Chromatic Tuner TU-3

The world’s top-selling stage tuner, the BOSS TU-3


Boss Chromatic Tuner TU-3

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
SKU: TU-3 Categories: , Tags: , , , , ,
Brands: Boss




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  • Tuning RangeC0 (16.35Hz)–C8 (4186Hz)
  • Reference PitchA4=436–445 Hz (1Hz step)
  • Tuning Accuracy±1 cent
  • Power SupplyDC 9 V: Dry battery 6F22 (9 V) type (carbon), Dry battery 6LR61 (9 V) type (alkaline), AC Adaptor (PSA series: optional)
  • Current Draw30 mA (DC 9 V), 85 mA (DC 9 V, when High Brightness mode is on)
  • AccessoriesOwner’s Manual, Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTES,” and “Information”), Dry battery/9 V type (6F22)
  • OptionsAC adaptor: PSA series, Parallel DC cord: PCS-20A


  • Width73 mm
    2-7/8 inches
  • Depth129 mm
    5-1/8 inches
  • Height59 mm
    2-3/8 inches
  • Weight390 g
    0 lbs. 14 oz.
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