Description: surplus from R&D laser university department. Seems to have very little use. SPECS: 200 micron (0,2mm) on a brass/copper/gold plate (not sure which material). This is really HIGH PRECISION. I have never seen such a nice high end pinhole through my loupe. It is just perfect. It comes with a rare mounting plate which also seems brass/copper and has three screws to mount that seem to allow it to be mounted yet onto another part. For measures, see pics.
Condition: absolutely great. Please, see pictures as these tell you exactly what to expect. Close-ups are taken through Wild 450 Epi high resolution loupe.