Boss TU-3 Chromatic Tuner Pedal with Bypass

Guitar and Bass Tuner Pedal with High-Brightness Mode for Outdoor Visibility, 21-segment LED Meter, Drop Tuning Support, and Guitar/Bass Mode
Boss TU-3 Chromatic Tuner Pedal with Bypass image 1
Boss TU-3 Chromatic Tuner Pedal with Bypass image 1
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Boss TU-3 Chromatic Tuner Pedal with Bypass
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The World's Best-selling Stage Tuner — Improved!

The TU-3 is more than just a rock-solid, dependable tuner for your guitar rig — it's practically a modern legend. The latest member of BOSS's world-famous TU Series, the TU-3 is made to work night after night, stomp after stomp. And since it now features a high-brightness mode for your outdoor summer festival gigs, it'll work day after day too — you can bet the TU-3 will be glare-free, offering up a large, clear LED display to help you get in tune.

As far as display goes, you have a few choices in how you prefer to tune up. Whatever you do, the Accu-Pitch function gives you visual verification whenever you're in tune (very handy). The TU-3 also has a chromatic mode for tuning by note name, then there's Guitar/Bass mode that lets you tune by string number — even string number for 7-string guitars and 6-string basses. Finally, there's a Guitar Flat mode for those of you that like to rock Drop tunings, down to six semitones below standard.

The BOSS TU-3 is definitely a pedalboard must have — and its predecessor, the TU-2, was the world's best-selling tuner pedal for good reason: it just works. What's also cool about the TU-3 is that it can supply power for up to seven BOSS compact effects pedals, so you can keep your pedalboard neat and tidy, and your power strip free of nasty wall warts. Get in tune, stay in tune — get the BOSS TU-3.

BOSS TU-3 Guitar Tuner Pedal Features at a Glance:
  • Stompbox-style guitar 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 mode (tune by string number, with support for 7-string guitars and 6-string basses)
  • Flat tuning is supported with Guitar Flat mode, which allows for Drop tunings up to 6 semitones below standard pitch
  • Tuner automatically mutes when the tuner is on
  • Can supply power for up to 7 BOSS compact effect pedals
Here's an unbeatable value and a pedalboard must have — the latest version of the world-famous TU Series tuner pedals, the BOSS TU-3!

Additional Media

BOSS TU-3 Owners Manual

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", 1 x 1/4" Thru
Power Supply 9V DC power supply (sold separately)
Power Supply Included No
Batteries 1 x 9V
Height 2.32"
Depth 5.08"
Width 2.87"
Weight 0.86 lbs.
Manufacturer Part Number TU-3

Customer Reviews

Based on 60 reviews
Write your review


Simple, yet way better/more responsive (immediate reading) than my Korg Pitchblack tuner. I use the Bypass for a Royal Blood type setup too

Great tuner

This is the best, most reliable, most usable tuner I've ever owned.
Music background: Worship Leader

Boss Chromatic Tuner

AWESOME tuner. I bought this pedal as a less expensive way to power my other three pedals. I already had a Boss TU-10 tuner which was OK. As a tuner this is easy to use, quick (no needle jumping from side to side as you zero in the pitch), easy to see, and accurate. My suggestion to anyone looking for a tuner is to skip working your way up from the $12.00 models and just spend the money up front. It will save you from wasting your time and money to get where you will end up any way.
Music background: Hobbyist

Boss TU-3

This a greet tuner, worth every penny. Works just as advertised and better. Sweetwqter is a wonderful place to deal with, service second to none.
Music background: Pro Musician

great tuner

great tuner... very easy to use..... total bypass and noiseless... I would recommend it hardly..
Music background: hobbyist

Sweetwater Advice

Jared Kalish

This pedal is an absolute lifesaver when you're on stage. I can't tell you the amount of times my bass has gone out of tune after I've been really laying into it for a song or two. Just look down, stomp the box and get yourself back to sounding like you should.
See also: Tuners, Boss, Boss Guitar Tuners