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Boss TU-02 Clip-On Guitar Tuner TU02

Product Information

Bright Color Display with Adjustable Viewing Angle
With a bright color display, swivel adjustment, and four selectable modes, the versatile TU-02 offers reliable tuning for guitar, bass, ukulele, and other stringed instruments.

Standard Features

  • Compact and accurate clip-on tuner with high-contrast color display
  • Four tuning modes: chromatic, guitar, bass, and ukulele
  • Up to 24 hours of continuous runtime with CR2032 lithium battery
  • Auto power off feature conserves battery life when not in use

Secure and Reliable

The TU-02’s high-contrast color display provides accurate, easy-to-view tuning everywhere you play. The rugged, padded clip securely grips to your instrument’s headstock, while swivel adjustment lets you position the display for the optimum viewing angle. A single CR2032 lithium battery provides continuous runtime up to 24 hours, and an auto power off feature conserves battery life when the tuner is idle.

Works with Guitar, Bass, Ukulele, and More

With its versatile modes and quick-change design, you can tune a variety of instruments with the TU-02. Choose from standard tuning modes for guitar, 4- and 5-string bass, and ukulele, or chromatic mode for alternate tunings and other stringed instruments. Flat tuning over a range of two semitones down is supported, perfect for players who like to tune low for a heavier sound. And with adjustable calibration from 430 to 450 Hz, you can set the tuner to a reference other than the default 440 Hz standard if needed.


Tuning RangeA0 (27.5 Hz)--C8 (4,186.0 HzReference PitchA4 (430--450 Hz)Tuning Accuracy+/- 1 centModesCHROMATIC / GUITAR / BASS / UKULELE
Flat Tuning: Regular--2 semitone lowerControlPOWER/M (mode) button
A4 button
Flat buttonDisplayBacklit color LCDPower SupplyACR2032 lithium battery x 1Current Draw7.5 mAExpected battery life under continuous useAlkaline: Approx. 24 hours
*These figures will vary depending on the actual conditions of use.Auto off functionApprox. 5 minutesAccessoriesOwner's Manual
CR2032 lithium batterySIZE AND WEIGHTWidth28 mm
1-1/8 inchesDepth38 mm
1-1/2 inchesHeight50 mm
2 inchesWeight (including battery)25 g
1 oz