GoGo Tuners TT-1 Clip-On Chromatic  Tuner Clip-on Tuner Two color screen backlight Chromatic, Guitar, Bass, Violin, Viola Wide detection range: A0(27.5Hz) - C8(4186.00 Hz) Choose internal mic or vibration sensor Pitch range: reference pitch from 430Hz - 450Hz (1Hz steps) Swivel mount rotates for easy viewing Auto power save and shut-off extends battery life Detection accuracy: +/-0.5cent Power supply: one 2032 button battery Dimensions: 71(l) x 38(w) x 60(h) mm Weight: 50g