Demonstration Lens Set of 6 – 38MM DiameterUS$4.29
Optically true lens with ground glass edges.
Demonstration Lens Set of 6 – 50MM DiameterUS$21.44
Includes one each of double convex, plano-convex, double concave, plano-concave, concavo-convex and convexo-concave lens.
Neutralization Lens SetUS$2.72
Two spherical lenses one is a double concave and the other a double convex.