Dense flint glass, refractive index 1.620 to 1.623.
In Stock
Diameter 25 mm, mounted in plastic eye-grip frame.
Metal holder with sides grooved to hold lens up to 50 mm diameter on wooden support.
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.
All plastic frame.