Korg PB02RD Limited Edition Red Version of the Pitchblack+ Reliable die cast aluminum housing with black-out finish provides improved contrast & visibility Double or Single Metering; Single offers four modes: Meter, Full Strobe, Half Strobe, and Mirror Supports 6-string bass & 7-string guitar; Open tunings (D, E, G, A); DADGAD; Five custom tunings 9 volt/200 mA cascade output for pedalboard convenience; Battery/AC Operation; 100 % True Bypass Highly accurate: +/- 0.1 cent; Wide E0 - C8 detection range; Calibration range from 436 Hz - 445 Hz