Boss TU-12EX Guitar and Bass Chromatic Tuner

Guitar and Bass Chromatic Tuner with Flat Tuning, LED Indicators, Accu-Pitch Feature and Built-in Condenser Microphone
Boss TU-12EX Guitar and Bass Chromatic Tuner image 1
Boss TU-12EX Guitar and Bass Chromatic Tuner image 1
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Boss TU-12EX Guitar and Bass Chromatic Tuner
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Accurate, Reliable Tuning!

The BOSS TU-12EX is the next evolution of BOSS's famous TU-12 guitar and bass tuner. The TU-12EX sports BOSS's dependable needle/LED indicators, so you can tune up quickly and accurately. But, this time around, BOSS added six half steps of flat tuning. Still onboard is BOSS's Accu-Pitch feature, with beeps, letting you know when you've reached tune. There's also a built-in microphone for your acoustic instruments, and a handy Auto-Off button, which helps to prolong the BOSS TU-12EX's battery life.

BOSS TU-12EX Guitar and Bass Tuner at a Glance:

  • An evolution of BOSS's famous TU-12 tuner

  • Accu-Pitch tuning mode lets you know audibly when you're in tune
  • Simply a rock-solid TU tuner from BOSS
An evolution of BOSS's famous TU-12 tuner

The BOSS TU-12 tuner has long been a favorite of guitarists and bassists: rugged, affordable, and accurate. And now, BOSS has evolved this famous tuner, so it has even more features. The new BOSS TU-12EX now features flat tuning (of up to six half steps), so you can easily reach the right tuning when you're not playing in standard.

Accu-Pitch tuning mode lets you know audibly when you're in tune

The TU-12EX features BOSS's popular Accu-Pitch tuning technology. When your string reaches the right tuning, the TU-12EX will sound a beep to verify you're in tune. It's a very handy way to quickly tune up without having to keep an eye on a needle.

Simply a rock-solid TU tuner from BOSS

BOSS pedals have achieved legendary status for good reason: not only are they ruggedly built to withstand stomp after stomp, day after day, but they're also purpose-driven tools that deliver the kinds of tones and functions that serious guitarists and bassists need. With BOSS's line of TU tuners, you can be sure you have pro-level tuning in your arsenal, whether you're playing a sold-out gig or rocking solo in the basement.

BOSS TU-12EX Guitar and Bass Tuner Features:

  • Chromatic and Guitar/Bass tuning modes

  • Needle-accurate metering
  • Accu-Pitch provides audible verification of tuning
  • Flat mode for drop-tunings
  • Auto-off prolongs battery life
  • Tuning Range: E0 (20.6Hz)-C8 (4,186.0Hz)
  • Reference Pitch: A4 (438-445Hz)
  • Tuning Accuracy: +/- 1 cent
  • Dimensions: 5-13/16" W x 2-1/8" D x 1" H
  • Weight: 5oz.
The BOSS TU-12EX tuner takes the famous TU-12 to the next level!

Additional Media

BOSS TU-12EX Owners Manual

Tech Specs

Type Chromatic
Format Portable
Display Type VU
Reference Pitch A4 = 438Hz-445Hz
Tuning Range E0 to C8
Inputs 1 x 1/4"
Power Supply Included No
Batteries 2 x AAA (Included)
Height 0.94"
Depth 2.13"
Width 5.83"
Weight 0.44 lbs.
Manufacturer Part Number TU-12EX

Customer Reviews

Based on 14 reviews
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Boss TU-12EX

Thank you (Sweetwater) I have the older version tu12 thats been dropped so many times I thought its time to purchase a new tuner. I wanted the same style got real lucky that Boss updated their TU12 version to the EX. Purchased it on a Friday would of been here Monday but a holiday still very fast shipping thanks again Sweetwater

Works forever, best tuner I've ever owned!!

I've been using the older model of this tuner for going on 15 years. Still as good as new! Works plugged in or with a mic, very precise and very reliable. I've used it for guitars, horns, violins, mandolins, banjos, etc etc etc. If you want a solid, reliable tuner, here it is
Music background: professional musician

Great Deal for Value

An awesome tuner, a must have for it's accuracy and dependability. Easy to setup and use, but I wished the background had a different LED colour (e.g. Green) once the string is on-tune. All and all, I would recommend it!


It does a great job just as it is nice set up all in one it wood be helpful for all tips of Guitar

Its a boss tuner

Its a boss tuner. The standard must have for guitarists and bassists.
See also: Tuners, Boss, Boss Guitar Tuners