The revolutionary Planet Waves S.O.S.
Guitar/Bass Tuner pulses two out-of-phase LED light beams directly onto the
vibrating string. When the string is out of tune, the two lights will visually
dance on the string being tuned. As you approach in-tune status, the movement
slows down and eventually stops when you are perfectly in tune. This
revolutionary visual tuning system enables precision tuning in silent or noisy
environments, without the need for audible sound or sensing of any kind.
