JOYO JT - 12B 360 Degrees Rotation LCD Guitar Tuner for Bass Ukulele ViolinDigital Tuner is more accurate・ very sensitive and wide range.Can rotates 360 degrees for easy view.A4 frequency: 430 - 450MHzTuning range: 0A ( 27.5Hz ) - 8C ( 4186.01Hz )Clip this unit on a flat surface or instruments.Powered by one CR2032 button battery.Tuning for Guitar・ Bass・ Violin・ Ukulele.