The new ET20 is a full-featured chromatic clip-on tuner for violin, viola, cello, and bass! Tuning range: A0 [27.5 Hz]~C8[4,186.0 Hz], accuracy ± 1 cent. A4 range: 440Hz or 442 Hz. Simple design with just one button. Auto power off, with settings saved on power off. Easily attaches to violin/viola pegbox, or cello/bass bridge. Weight 23 grams. Battery included.