Harley Benton MT100 clamp tuner - integrated metronome, built-in microphone and vibration sensor, wide adjustable illuminated display, calibration: 430-450Hz, 3 tuning modes (chromatic, guitar & bass, violin), tuning scale: C, F, Eb, Bb (for chromatic mode), flat tuning (1-4 semitone steps), tuning range: A0 (27.5Hz) - C8 (4186Hz), measuring range: +/-1 cent, metronome: 30-250 bpm with 1 beat step. Automatic power off. Includes 3V button battery (CR2032).