The BOSS TU-3S Chromatic Tuner provides the same function, accuracy, and display, as the TU-3—a go-to stompbox tuner for many electric guitarists. However, this model doesn't sport a muting footswitch; it's always on. This feature, in addition to its small size, renders it suitable for integration in any pedalboard or stompbox rig in which space-saving is paramount. It features tuning modes for six- and seven-string guitars, bass and six-string bass guitars, as well as flatted options for players who like to operate in lower frequencies.