Richter M2M Focal Plane Micrometer ^

This laboratory unit has a specially prepared Pyroceram optical flat mounted on a spindle of a large Starrett micrometer. It provides a means, in conjunction with Precision Lens Standard adapters , of checking flange to focal plane separation to an accuracy of  reading to .002 mm. May also be ordered made from stainless steel at additional cost. (Lens standard is optional)