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Boss TU-3S Chromatic Tuner

Compact Guitar and Bass Tuner Pedal with 21-segment LED Meter, Drop Tuning Support, and Guitar/Bass Mode
$99.99

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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!

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Tech Specs

  • Type: Chromatic
  • Format: Pedal
  • Display Type: LED, Cent, Stream
  • Reference Pitch: A4 = 436-445Hz
  • Tuning Range: C0-C8 (16.3-4186Hz)
  • Accuracy: ±1 cent
  • Tuning Modes: Flat, Guitar, Bass
  • Inputs: 1 x 1/4"
  • Outputs: 1 x 1/4"
  • Bypass Switching: Buffered
  • Power Supply: 9V DC power supply required (sold separately)
  • Power Usage: 35-95mA (in High Brightness mode)
  • Height: 2.25"
  • Width: 2.88"
  • Depth: 3.31"
  • Weight: 8 oz.
  • Manufacturer Part Number: TU-3S

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Customer Reviews

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Rated 5/5

Get Shorty!

This is the same BOSS TU-3 super tuner you know and love, just minus the battery compartment (9v adapter operation only) and footswitch (as it is always on!) It is also a 9v power distributor.

This unit was perfect for myself because I needed a true bypass inline tuner before my amp. My Thunderfunk TBA-750 mutes at the input, so none of the outputs are tuner through sends. It sits at the rear of my rack, angled up and allows me to mute at the amp and tune easily. The TU-3s also provides power to a HPF and compressor for loop #1 in the rear of the amp rack case.

The TU-3s and OneSpot 9v adapter fit into a small Cannon 35mm camera lens case for travel...

Perfect!
Music background: Played a lot of Bass...
Rated 5/5

Quick Tune

A solid little unit. Easy to read in the dark with the brightness adjustment. Have not noticed any noise when added in the chain. Work well with Bass tuning by selecting the bass mode. Boss did a great job designing a solid unit with great features.
Music background: Musician
Rated 5/5

It speaks for itself...

It's the perfect tuner for a floor-rig which already has a bypass. I run it before my LR Baggs VP DI. Same reliable tuning as the TU2/TU3, with a smaller footprint and sans the foot switch. If you run low-to-standard draw pedals, it will power those too. My VP DI does not like getting power from it unfortunately, but my other pedals run off of it just fine.
Rated 5/5

Boss tuner

worked great!! Fast shipping.
Rated 5/5

This should be normal

I went from having the old school LCD non-backlit tuner to this, so it's been amazing. I'm not classically trained and so having it on has been enlightening and I feel like I am learning more this way. Everyone should probably have one.

It came with a power cord to extend power out to like two additional pedals piggybacking off of the TU-3s's source, which is cool if you don't have a big supply. Hoping to never go back, and not having the foot switch is nice.
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