Optical flat

Double sided Optical Flats Double sided optical flats may be used as a reference (test plate) against which the flatness of an unknown surface can be compared or as an optical window Double side optical flats has high accuracy in flatness and parallelism Double side optical flats is used for verifying the surface flatness and parallelism of micrometer, lever micrometer, lever-type snap gauge, Micrometer caliper ect. The double sided optical flats are divided into four series, each of which is divided into six groups, each with four pieces.