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The BOSS TU-80 brings super-accurate LCD tuning to musicians at a very affordable price, while adding unique high-end features like a built-in metronome and Accu-Pitch. The pocket-sized TU-80 runs on batteries and can tune almost any instrument, thanks to a chromatic tuning mode and ultra wide tuning range. It even tunes 7-string guitars and 6-string basses—putting the TU-80 in a class all its own.