Dense flint glass, refractive index 1.620 to 1.623.
In Stock
Rectangular, glass, back silvered, with protective coating, pack of 10.
Clear glass, ground edges.
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.
With 6 mm diameter Metal rod, to fit into standard optical bench mounts and stands.
Free from air bubbles, all sides polished.