cross grating material measure, crossed-grating material measure, cross grating measurement standard, crossed-grating measurement standard, type CG-1 or CG-2 measurement standard
material measure/measurement standard with two-dimensional array pattern that may be made up of raised lines, grooves or dots, kahemõõtmelise massiivvõremustriga mõõt/etalon, mis võib koosneda reljeefsetest joontest, soontest või punktidest