Scale:12 equal tempered, Pythagorean, Werckmeister III, Vallotti, Mean Tone Eb, Kirnberger III, Young,Mean Tone D#, KellnerTranspose Range:C, C#, D, Eb, E, F, F#, G, G#, A, Bb, BDetection Range:A0 (27.50 Hz) C8 (4186 Hz)Reference Tone:C2 (65.41 Hz) C7 (2093 Hz), five octave,two-step volume controlTuning Modes:AUTO (SLOW, MEDIUM, FAST), MANUAL, SOUND BACKCalibration:A4 = 349 499 Hz (1 Hz steps)Detection Accuracy: ± 1 centSound Accuracy: ± 1.5 centConnections:INPUT (1/4 jack), OUTPUT (1/4 jack), DC IN (9 V)Power Supply: two AAA batteriesBattery Life:approx. 100 hours (with alkaline batteries, in meter mode (MEDIUM), continuous A4 tone, without backlit)Jack input and outputDimensions:2.91 (W) x 4.71 (D) x 1.42 (H) /74 (W) x 120 (D) x 36 (H) mmWeight:6.81 oz. (including batteries) /193 g (including batteries)