Korg Pitchblack Chromatic Tuner Reliable die cast aluminum housing with black-out finish provides improved contrast & visibility Easy-to-read display features four modes: Meter, Full Strobe, Half Strobe, and Mirror 100 % True Bypass preserves tonal clarity; Battery or optional AC Operation Similar size & shape as many pedal effects; 9 volt/200 mA cascade output for pedal board convenience Wide E0 - C8 detection range; Calibration range from 436 Hz - 445 Hz