Boss is often one of the first brands that comes to mind when guitarists think about chromatic tuning pedals. Now, the tech and usability of the TU-3 has been packaged into an even smaller and more pedalboard-friendly enclosure for those players with even less room to spare. Refusing to compromise on functionality, the only sacrifice TU-3S users have to make is with the footswitch, which this smaller unit doesn't include. Otherwise, the display and tuning functions remain the same from pedal to pedal.