The Pro BOSS TU-30 is both Tuner and Metronome in one compact unit. This pocket size tuner, has many features compared to recent BOSS tuners including; Accu-Pitch, multiple tuning modes and rhythm patterns, the ability to sound reference pitches, and more. The LCD display has simple operation thanks to the blue press-pad buttons and clear labels. With its small size and easy operation, it is the perfect companion for any musician, and can even fit into most instrument cases.