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The ABFO No 2 type scale is unique in its design. the incorporation of three circles is useful in helping to identify and compensate for distortion resulting from oblique camera angles. Graduations are metric, the width of the legs are one inch wide for standard reference. The centimeter division lines are longer for tracing over and extending across the photographic print for gridding purposes. Measurements within the image are then made relative to the inscribed 1cm grid lines to compensate for distortion resulting from non-parallelism between the film and object planes. The gray areas of the scale have a reflectance value of approx. 18%. Constructed from "L" shaped laminated plastic 1mm thick. The mm markings are accurate to 0.1mm on inner edges. Overall size is 105mm x 105mm.
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