The BOSS TU-3 Chromatic Tuner continues the BOSS legacy of a flagship stomp-box style guitar tuner, found in pedal boards around the world. Extremely accurate - the TU-3 is capable of measurements +/- 1 cent. New features found on the TU-3 include an ultra bright display mode for live shows, and both a 21 segment LED VU and strobe style visualisation modes. The TU-3 will automatically mute your output when engaged, and offers two tuning modes: Chromatic and Guitar / Bass. Guitar / Bass allows you to tune via string number with support for 7 string guitars and 6 string basses.