Bench has two steel rods, one of which is graduated in mm with heavy metal end. Supports with leveling screws with four metal slides which slide smoothly on the bench. Two of the slides have transverse motion arrangement. Complete with two lens holders and two object needles. Lens convex 38mm with 10, 15, 20cm focal length.
|Graduated to 1 m
|Graduated to 1.5 m