Ideal for guitar, bass and ukulele, the clip-on TU-01 is the most affordable tuner in the trusted BOSS range. Small, durable and simple to use, it provides convenient, reliable tuning right on the headstock of your instrument. A bright, attractive display includes a digital meter and note indicator, plus two LEDs that indicate when you're perfectly in tune . The TU-01 also adapts to different viewing angles and folds up for easy transport in your suitcase or case.