50mm polarized lens pair holder

This frame holds two 50mm polarized lenses. The friction fit holders allow each lens to be rotated through about 120 degrees. The base is designed for bolting down to a standard optics bench. The frame and base are joined by a friction-fit 5mm metal rod that allows the height to be adjusted. A 3/16 inch dowel would work also. One side is marked off in 10 degree increments with a pointer on the lens holder. This is not a precision device.