Chromatic Tuner

The World's First Tuner with Accu-Pitch.

The World's First Tuner with Accu-Pitch.

The BOSS TU-15 Chromatic Tuner gives guitarists the most accurate tuning possible—bolstered by new Accu-Pitch and Octave Adjust functions—plus popular Drop D, open and flat tunings. A backlit needle and LCD make tuning easy, while improved high-impedance inputs let you connect between an amp and guitar without signal loss.

  • - Accu-Pitch verifies intonation by playing a note when correct tuning is reached
  • - Versatile modes: Drop D, Open D/E/G/A, DADGAD and flat tunings up to 5 semitones
  • - World's first Octave Adjust function simplifies tuning using open string and 12th fret
  • - High impedance input keeps tuner transparent when connected between guitar and amp
  • - Choice of backlit needle or LCD tuning - tune up anywhere!
Relevant product
Reference Pitch
A4 = 430 Hz to 449 Hz (1 Hz step)
Tuning Range
E0 (20.6 Hz) to C8 (4186.0 Hz)
Tuning Accuracy
+/- 1 cent
Input Impedance
10 M ohms
Meter, LCD Display
27 mm x 1 dynamic type
Input Jack, Output Jack, AC Adaptor Jack
Power Supply
Dry Battery [R6/LR6 (AA) type] x 2; DC3V, AC Adaptor DC9V (PSA series; optional)
Power Consumption
15 mA (backlit off and SOUND mode off), 55 mA (backlit on and SOUND mode on)
* Expected battery life under continuous use (Carbon): Approximately 45 hours (backlit off, SOUND mode off and A4 continuous input), Approximately 15 hours (backlit on and SOUND mode on)
*These figures will vary depending on the actual conditions of use.
Dry Battery [R6 (AA) Type] x 2, Owner's Manual
AC Adaptor (PSA series)

Size and Weight

Width (W)
149 mm5-7/8 inches
Depth (D)
58 mm2-5/16 inches
Height (H)
40 mm1-5/8 inches
190 g0 lbs. 7 oz.

All specifications and appearances are subject to change.


To the top of page