The document specifies dimensions and requirements for the finish of testing glasses for radii used in the testing of surfaces of optical components for surface form tolerances.
DIN 58161-2:2002 history
2002DIN 58161-2:2002-04 Testing of optical components - Part 2: Test glasses with spherical surface
2002DIN 58161-2:2002 Testing of optical components - Part 2: Test glasses with spherical surface