RotoSound AT-350 Guitar/Bass/Violin/Viola Chromatic Clip-On Tuner For Guitar, Bass, Acoustic, Violin, or Viola Tuning Key - C, F, B, E Detection Range - A0 (27.5Hz) to C8 (4186.0Hz) Pitch Range - 430Hz to 450Hz (1Hz stops) Detection Accuracy -  0.5%