Impeccable device to tune guitars and basses. the colored LEDs facilitate the voices in the dark (green = good, red = not good). It can be tuned over a 6,3mm Basses and electric guitars, the built-in micro also allows tuning of acoustic Istrumenten and a tuning pitch can also be generated. What more do you want? And to whom I could get only scrap 15 years ago at a price.