A 75 mm diameter circular metal disc with 12.5 mm central aperture.
A screw controlled spring loaded precision slit is mounted on one side of the disc.
Max opening 4 mm wide and 10-12 mm long.
Pocket type magnifier mounted in single body with a metal cover which doubles as a handle fitted with a single lens of diameter 18 mm with a magnification of x 10.
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.
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