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BOSS TU-12EX Chromatic Tuner Best Guitar Tuner Chromatic and Guitar Tuning Modes with Built-In Mic and Needle-accurate Metering


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This successor to the legendary TU-12 provides BOSS' famous needle/LED indicators for fast, accurate tuning. Other features include Flat Tuning of up to six half steps, ACCU-PITCH with an audible beep, a reference tone, a built-in microphone for acoustic instruments and battery-saving Auto-Off.

- Chromatic and Guitar tuning modes
- Needle-accurate metering
- Accu-Pitch provides audible verification of tuning
- Flat mode for drop-tunings
- Auto-off prolongs battery life

Needle-Accurate Metering
In the tradition of its top-selling TU-12 predecessor, the new TU-12EX offers needle-accurate metering for precision tuning, including high-visibility sharp and flat indicators to ensure perfect tuning. Never play out of tune again!

Built-In Mic
The TU-12EX offers two forms of input: a line input or the built-in microphone. Plug your electric guitars and basses into the Line input, or simply point the built-in mic at acoustic guitars or other instruments that aren't equipped with a pickup. It's super convenient!

Drop-Tuning Support
For guitarists who drop-tune, the TU-12EX offers a special Flat Tuning mode, which lowers the pitch in user-defined semitone increments. The range can be set for up to six semitones.



1. Can the BOSS TU-12EX be used to adjust the intonation of a bass?

  • Yes. 

2. Does the BOSS TU-12EX have a silent mode?

  • Yes. The BOSS TU-12EX has a silent mode for tuning on stage.

3. Does the BOSS TU-12EX fit on the BOSS BCB-60?

  • Yes.

4. Does the BOSS TU-12EX have a metronome?

  • Yes, the BOSS TU-12EX has a metronome function.

5. Does the BOSS TU-12EX work with an acoustic guitar?

  • Yes.

6. Does the BOSS TU-12EX work on a piano?

  • Yes.

7. How loud is the metronome on the BOSS TU-12EX?

  • The metronome is loud enough to play any instruments

8. Can the BOSS TU-12EX tune a string on the 12th fret?

  • Yes. The BOSS TU-12EX has a tuning range of E0 to C8.

9. Is the BOSS TU-12EX visible under sunlight?

  • Yes.

10. Does the BOSS TU-12EX work with a power supply?

  • Yes.

11. Does the BOSS TU-12EX work with a 6-string bass?

  • Yes.

12. Can I use the BOSS TU-12EX to play drone notes?

  • Yes.

13. How can I use the BOSS TU-12EX with a BOSS BCB-60?

  • The BOSS TU-12EX can be connected to the BCB-60 using standard ¼” guitar cables.

14. Can I turn the beep sound on the BOSS TU-12EX?

  • Yes, by pressing the speaker button while turning the BOSS TU-12EX on.


  • Tuning Range: E0 (20.6 Hz)- C8 (4,186.0 Hz)
  • Reference Pitch: A4 (438- 445 Hz)
  • Tuning Accuracy: ± 1 cent
  • Power Supply: Dry battery R03 (carbon) or LR03 (alkaline); (AAA) type x 2; DC 3 V, AC adaptor DC 9V (PSA series; optional)
  • Current Draw: 12 mA
  • Expected battery life under continuous use (carbon): Approximately 15 hours *This figure will vary depending on the actual conditions of use.
  • Accessories: Dry battery (R03 (AAA) type) x 2 (carbon), Owner's Manual, Soft Case, Leaflet ("USING THE UNIT SAFELY" and "IMPORTANT NOTES"), Information

Size & Weight (Incl. Batteries)

  • Width: 148 mm, 5-13/16 inches
  • Depth: 54 mm, 2-1/8 inches
  • Height: 24 mm, 1 inch
  • Weight: 0.1 kg, 0 lbs. 5 oz.

*The specifications are subject to change without notice.

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