Equilateral, cemented, with hole and stopper.
In Stock
All plastic frame.
Optically worked, back silvered, with protective coating.
Brass dial head 40 mm diameter divided and marked in 100 divisions, vertical scale 10-0-10 mm, fitted on heavy brass disc, with 3 pointed legs, distance between legs 40 mm.
Moulded glass, all sides polished.