Q13 The small Kodak Gray Scale Q13 is a quality control device of stepped, neutral values to help the photographer, compare the tone values of reflection originals with the tone values of the reproduced image, compare exposureprocessing in a photographic environment so that changing conditions can be identified, measuredcontrolled, "balance" negativespositives in a traditional color reproduction process that requires the use of masks, separation films,filters,determine values for plotting tone-reproduction curves.
Kodak Q-13Q-14 are otherwise equal except the size, 8"14" respectively.