The Snark S-5 Mini Guitar & Bass Tuner is one of the smallest clip-on tuners out there. It's fully chromatic and at just 1 x 1 inch hides perfectly behind your headstock. The bright diplay is big and easy to read, while the design is rugged enough to resist the riguers of stage and travel. The S-5 is ultrafast and accurate and works on acoustic and electric basses and guitars.