A method and apparatus for optically inspecting a display employs sub-pixel accuracy for each primary color to take into account angle of rotation. A plurality of storage devices are interconnected by a communication medium. The insert houses a hypodermic syringe. The light signal plus the second fat zero is transferred out of the photodiode and the sampled signal is subtracted therefrom, leaving only the light signal. The reed assembly is free of grooves and O-rings that modify the tone produced by the reed assembly.