Double Convex Lens, 300mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs sold2025 We took this design one

We took this design one step further and added our Speed mark fractional graduations to the blade

but if you use a 6-inch triangular prism may be works best because you can twist the prism into creating a curve and bend-like distortion of your surroundings

Finish/plating: nickel

5 inch disc are compatible with most 5 random orbit sanders

Double Convex Lens, 300mm Focal Length, 3" (75mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms - Eisco Labs sold2025 We took this design oneDouble Convex Lens, 300mm Focal Length, 3" (75mm) Diameter Spherical, Optically Worked Glass Lens Ground Edges, Polished Great for Physics Classrooms Eisco Labs Our mission is simple; to be TRUSTED by educators, researchers, and scientists throughout the world to design, manufacture, and DELIVER products that allow LEARNING and the development of scientific knowledge. For over 50 years, Eisco Scientific has been manufacturing and selling quality