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Chromatic Tuner Note: 12 Even Tempered scale, A0~B7 (8 Octave) Built in microphone for acoustic, Line-in jack for electric Guitar Tuner Note: 1E, 2B, 3G, 4D, 5A, 6E Tuning: Wide Screen LCD simulates a tuning meter. Tolerance: +/- 0.5 cents, uses Quarts Crystal. Calibration mode: pitch shift (430~449Hz, 1Hz step) & Transpose mode (4 step flat for guitar)