tu-02Clip-On Tuner


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.

Introduction Movie

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 Range
A0 (27.5 Hz)--C8 (4,186.0 Hz
Reference Pitch
A4 (430--450 Hz)
Tuning Accuracy
+/- 1 cent
Flat Tuning: Regular--2 semitone lower
POWER/M (mode) button
A4 button
Flat button
Backlit color LCD
Power Supply
ACR2032 lithium battery x 1
Current Draw
7.5 mA
Expected battery life under continuous use
Alkaline: Approx. 24 hours
*These figures will vary depending on the actual conditions of use.
Auto off function
Approx. 5 minutes
Owner's Manual
CR2032 lithium battery
Size and Weight
28 mm
1-1/8 inches
38 mm
1-1/2 inches
50 mm
2 inches
Weight (including battery)
25 g
1 oz
*The specifications are subject to change without notice.



If you have questions about operating your BOSS product, please check our Knowledge Base for answers to the most common questions.
You can also contact our Product Support department by phone or email.
In addition, we have a library of Owner’s Manuals and Support Documents that you can download and reference.