All ACCU-Place Dot Pattern standards have indexed columns and rows for ease of use. Ideally suited for checking / verifying / quantifying optical (barrel) distortion; alignment between optical systems (or paths); as well as calibrating optical instruments that have both a vision and motion system.
||Chrome on GLASS
||4.0 in. x 4.0 in. - 101.6mm x 101.6mm
||51 rows x 51 columns