Korg TM40 Large Display Digital Tuner and Metronome Scale: 12 note equal temperament Detection Range*: C1 (32.70Hz) - C8 (4186.01Hz) for a sine wave Reference Tone: C4 (261.63Hz) C5 (523.25Hz) One octave or A Bb Tuning Modes: Meter mode (AUTO), Sound Out mode (MANUAL) Calibration Range: A4 = 410Hz 480Hz