collapse expand iconDescription

BOSS is proud to offer the TU-3, a stompbox tuner designed for guitarists and bassists who demand the utmost accuracy. Featuring a high-visibility 21-segment LED meter, the TU-3 tunes to within 1 cent of accuracy and provides visual Accu-Pitch verification. With dedicated modes for chromatic, guitar and bass tuning—supporting 7-string guitars and 6-string basses—the TU-3 is ideal for any instrument.

High-Visibility Meter Ensures Accurate Tuning

Whether on a dimly lit stage or in direct sunlight, the TU-3's 21-segment LED meter is optimized for visibility. Adjust the brightness to your preference or activate the high-visibility mode for the clearest view of sharp, flat or in-tune readings. The TU-3's precision tuning circuitry achieves an accuracy of +/- 1 cent so you can tune with confidence at any volume.

Dedicated Modes for Any Instrument

The TU-3 provides Chromatic mode for tuning by note name, as well as Guitar and Bass modes for tuning by string number. Guitar mode supports 6-string guitars, while Bass mode supports 4, 5 and 6-string basses. Seven-string guitarists will appreciate the TU-3's full support for their extended-range axes. Once a mode is selected, the TU-3 automatically detects the pitch of each string as you play it, indicating sharp, flat or in-tune.

Clean Power and Automatic Muting

In addition to precision tuning, the TU-3 supplies power for up to 7 additional BOSS compact pedals. A single connection to your pedalboard's power supply is all that's needed to power the TU-3 and a full effects chain. The tuner also features an automatic muting function, instantly silencing your signal when the tuner is activated for a clean, distraction-free tuning experience.

Rugged and Roadworthy

With a durable metal chassis and footswitches built to last through years of stomping, the TU-3 is perfectly suited for life on the road or in a recording studio. Pick up the BOSS TU-3 at for your most accurate, dependable and versatile tuner yet.

BOSS TU-3 Chromatic Tuner Pedal Power Solution Bundle
BOSS TU-3 Chromatic Tuner Pedal Power Solution Bundle
BOSS TU-3 Chromatic Tuner Pedal Power Solution Bundle

collapse expand iconFeatures

Package includes:
  • BOSS TU-3 Chromatic Tuner
  • PSB-120 AC Adaptor with detachable AC power cord
  • PCS-20A Parallel DC Cord
  • 12 premium BOSS picks

collapse expand iconSpecs

TU-3 Chromatic Tuner
  • 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 7 BOSS compact effect pedals (with optional PCS-20A Cable)
  • Accessories:
  • Owner's Manual
  • Dry battery/9V type (6F22)
  • Tuning Range: C0 (16.35Hz) -C8 (4186Hz)
  • 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: 2.8" x 5.12" x 2.37" (73 x 129 x 59)
  • Weight: 14 oz. (390 g)
PSB-120 Tech Specs
  • Input voltage range: 100-240V/50-60Hz
  • DC output: 2000 mA maximum
  • Output voltage: 9V
  • Configuration: sleeve positive, tip (center) negative

collapse expand iconWarranty

Boss pedals - 5 year parts warranty
90 day labor warranty.
1 year warranty - Multitracks, Jamstations, etc.
Check with manufacturer for specific product warranty.