NEW: All of these Ronchi Rulings and Grid patterns are available on 12mm, 16mm and 25mm glass discs, 1.5mm thick - ideal for experimental work and optical benches. E-mail email@example.com for more information.
Vacuum deposited chrome on glass grid patterns in a variety of pitches. All supplied on 50mm x 50mm B270glass, 1.5mm thick, ruled over the entire surface.
* grid size in images below not to scale