CT20 is a clip-on tuner designed for guitars, basses, and other stringed or wind instruments. It attaches to the headstock with a 360° swivel clip for easy viewing and features a full color LCD display. It offers chromatic, guitar and bass modes, a built-in mic and piezo sensor for vibration tuning, and a pitch range of A410–490 Hz. It supports flat tuning, real-time tuning, and energy-saving auto-off with a CR2032 battery included.