The  ET40 is a full-featured chromatic clip-on tuner for violin, viola, cello, bass, guitar & more! Tuning range: A0(27.5Hz) cs(4,186.0Hz), A4 range: 430Hz 450Hz. Flat tuning: b, bb. Precision:+/• 1 cent. Response time: 20ms. Power 3V {CR2032 lithium batter). Auto power off, with settings saved on power off. Easily attaches to violin/viola pegbox, or cello/bass bridge. Weight 28 grams. Battery included.