Boss TU-3 Chromatic Tuner Pedal


96 out of 100. Incorporating 4350+ ratings and reviews.

Street Price: 

Boss TU-3 Chromatic Tuner Pedal

Boss are well known for building robust effects pedals, and that applies to the Boss TU-3, which is a favorite of many guitarists and bassists.

Not only does the TU-3 have guitar, bass and chromatic tuning modes, it can also display notes for 7 string guitars and 6 string basses.

Guitar mode also supports alternative drop tunings.

The optional PCS-20A Parallel Daisy Chain DC Cord (Link to Amazon) allows you to power up to 7 other pedals when using the tuner with the PSA-120S power adapter (Link to Amazon).


  • Tuning Accuracy: ±1 cent
  • Tuning Range: C0 (16.35Hz)–C8 (4186Hz)
  • Reference Pitch: A4=436 ti 445 Hz (1 Hz step)
  • Tuning Modes: Chromatic and Guitar/Bass mode (tune by string number, with support for 7-string guitars and 6-string basses)
  • Display: 21-segment LED meter with brightness control
  • Bypass: Buffered
  • Power Supply: DC 9 V: Dry battery 6F22 (9 V) type (carbon), Dry battery 6LR61 (9 V) type (alkaline), AC Adaptor (PSA series: optional) - can supply power for up to 7 Boss pedals
  • Battery Life: Not specified
  • Dimensions: 2-7/8" (73 mm) x 5-1/8" (129 mm) x 2-3/8" (59 mm)
  • Weight: 14 oz (390 g)

Although I didn't do a comprehensive count, I did notice the word "love" in more than a dozen positive customer reviews. Those who had upgraded from the earlier TU-2 were impressed by the increased level of accuracy of the TU-3. Many guitarists who had used it at outdoor venues praised the brightness of the display. Positive sentiment was evident from both electric and acoustic-electric players. The quality of the build also came in for much praise from those who had been using it for a long time.

There were few consistently reported negatives. A couple of people complained about the price and one person even suggested the power adapter should be included in the price - but this is rarely the case with guitar pedals in general.

Boss says the TU-2 was the highest selling pedal tuner in its day and the upgraded TU-3 is doing just as well now.

Although this was previously on our recommended list, and despite its high ratings, there are now more highly rated options available which you can see in our guide to The Best Guitar Tuners.

About the Author

Alexander BrionesAlexander Briones

I've written about and researched music gear for many years, while also serving as a music director at my local church, in addition to teaching guitar, bass and mentoring young musicians.