Boss TU-3S Chromatic Tuner

Compact Guitar and Bass Tuner Pedal with 21-segment LED Meter, Drop Tuning Support, and Guitar/Bass Mode
Boss TU-3S Chromatic Tuner image 1
Boss TU-3S Chromatic Tuner image 1
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Boss TU-3S Chromatic Tuner
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A Compact Tuner for Your Pedalboard

The BOSS TU-3S chromatic tuner pedal takes everything you love about the popular TU-3 and scales it down in size by eliminating its pedal switch. Beyond that, you get the same rock-solid tuning and innovative features that you've come to expect from the TU-3, such as an easy-to-read LED display and various tuning modes. Chromatic mode is ideal for tuning by note name, while Guitar/Bass tunes by string number - even for 7-string guitars and 6-string basses. Guitar Flat mode is tailor-made for Drop tunings. Always on and ready to go, the BOSS TU-3S is a pedalboard necessity!

BOSS TU-3S Chromatic Tuner Pedal Features at a Glance:
  • A compact version of the TU-3 chromatic tuner pedal
  • 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 modes (tune by string number, with support for 7-string guitars and 6-string basses)
  • Guitar Flat mode allows for Drop tunings up to 6 semitones below standard pitch
  • Always on and ready to go
  • Can supply power for up to 7 BOSS compact effect pedals
Keep your axe in tune with the BOSS TU-3S chromatic tuner pedal!

Tech Specs

Type Chromatic
Format Pedal
Display Type LED
Reference Pitch A4 = 436Hz-445Hz
Tuning Range C0 to C8
Inputs 1 x 1/4"
Outputs 1 x 1/4"
Power Supply 9V DC power supply required (sold separately)
Height 2.25"
Depth 3.31"
Width 2.88"
Weight 8 oz.
Manufacturer Part Number TU-3S

Customer Reviews

Based on 6 reviews
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It is perfect for me. There are numerous indicators that you are close, spot on, and confirmation of spot on. The screen is easier to see than on most tuners that visibly have a pedal in between your eyes and the screen. The screen is at an angle facing my eyes. And, the added brightness setting is welcome. I perform with sunglasses and the added brightness allows me to see the screen even with the sunglasses. Yo Boss... excellent! Further, my sales engineer, Josh Sackett helped me find what was perfect for me. Sweetwater, I think Josh deserves a raise.
Music background: many years

The Perfect Design

I have a pedal board - and like everyone else - I have every square inch spoken for. This tuner takes up a small footprint and does what I need it to do - tune my guitars - without hogging up a ton of real estate. Bright display - easy to read - easy to use. Perfection.
Music background: Guitarist

Love it!

Easy to use and understand (alternate tunings). Perfect size for a pedal board. Does what a tuner is suppose to do.

Always On

I've always loved using Boss Tuners, and when I finally heard that they were coming out with a smaller version I was stoked! The TU-3S display is the same as the TU-3 and the always on feature is perfect for me. I used the tuner out of my volume pedal, so I didn't need the tuner to turn off. It also saves a LOT of space on my board without losing the feel of the Boss Tuner. I would recommend it for those who use volume pedals and don't need to switch off their tuner.
Music background: 13 year guitar player


This thing is amazing! I love that it doesn't turn off unless you unplug it from it's power source. It is extremely useful for pedal boards. Before this, I had a tu-2 it still works great, but this one never turns off! I run this from the tuner out of my volume pedal and can tune silently. I'd recommend this to any one who users the tuner out on their volume pedals on their pedal board!
See also: Tuners, Boss, Boss Guitar Tuners