Chromatic Tuner

Chromatic Tuner For Guitar & Bass

Chromatic Tuner For Guitar & Bass

This successor to the legendary TU-12 provides BOSS’s 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
Relevant product

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.

Tuning Range
E0 (20.6 Hz) to C8 (4,186.0 Hz)
Reference Pitch
A4 (438 to 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.
Dry battery (R03 (AAA) type) x 2 (carbon), Owner’s Manual, Soft Case, Leaflet (“USING THE UNIT SAFELY” and “IMPORTANT NOTES”), Information

Size and Weight

Width (W)
148 mm5-13/16 inches
Depth (D)
54 mm2-1/8 inches
Height (H)
24 mm1 inches
138 g0 lbs. 5 oz.

(including batteries)

All specifications and appearances are subject to change.


To the top of page