Peter Dillon asked:

> Could anybody please tell me where it is possible to obtain
> a Ruttner micro metric scale that will fit in to the eyepiece of
> my stereo - microscope.

Here's a few companies that sell micrometer scale inserts.
I'd guess that specialized versions might be "special order".

http://www.tri-esssciences.com/Microscope%20Accessories.htm#MICROMETER

http://www.emsdiasum.com/ems/materials/tools.html


        jim