The Kodak R-14 Control Scale is a quality control and calibration device used to standardize and control light exposure.
Professional Kodak accessories have been and remain indispensable in the equipment inventory of the photographer for the control of the chromatic equilibrium, of the just exposure and density they are the single credible and tested point of reference.
14 step Kodak Gray Scale with a density range of 0.05 to 2.00 in density increments of 0.15
A two-step shift is equal to a change of 1 f-stop or a doubling/halving of the exposure
A line grid is incorporated for checking camera focus