Navigate this Product

TU-70: Guitar/Bass AutoTuner


The BOSS TU-70 is the world's first compact guitar and bass tuner with a backlit LCD. This extremely accurate tuner offers greatly improved resolution over anything in its class—marking it as an affordable alternative to more expensive analog tuners. Its extreme durability and backlit design make it perfect for guitar and bass players on stage.

  • World's first guitar and bass tuner with backlit LCD
  • Smooth LCD needle movement for the most accurate tuning in its class
  • Flat and double-flat tuning, plus open D, E, G and A tunings
  • Shows both guitar string and fret icons for more intuitive operation
  • Display can be changed to accommodate 4-string, 5-string and 6-string basses


If you have questions about operating your BOSS product, please check our Knowledge Base for answers to the most common questions.

You can also contact our Product Support department by phone or email.

In addition, we have a library of Support Documents that you can download and reference. If Support Documents are available for this product, they will be listed below.

Support Documents

BOSS Guitar Effects Guidebook
BOSS offers an extensive selection of guitar effects that can be used by guitarists to get any kind of sound you can imagine. Here's a quick reference guide to the type and function of each unit.