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Two patterns are available, 0 - 7 and -2 - 7, produced in accordance with the USAF Resolving Power Test Target 1951 Standard. The most popular range is 0-7 group, with 6 elements per group, an element consisting of two target patterns of 3 lines at 90 degrees to each other, the line space ratio being equal. These charts are produced as a chrome surface image on glass plate. The R70 has an image area of 12 x 12mm on a 51mm square plate and the R71 has an image area of 48 x 48mm on a 75mm square plate. Both plates are 1.5mm thick.