This target is also known as the NBS 1010A Microcopy Test Chart and the ANSI/ISO Test Chart #2. It consists of five bars of equal spatial frequency (equal lines and spaces) in the horizontal and vertical directions. There is a total of 26 groups that range from 1 to 18 cycles (or line pairs) per mm. The spatial frequency is indicated by the number adjacent to each group.
The target's active area is 45 mm x 45 mm on a 100 mm x 100 mm substrate, packaged in its own storage box. The features can be provided in chrome on glass or on photographic film or paper.