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United Scientific DEMO50 50 MM DEMONSTRATION LENS SET, GLASS 1/EA
50 MM DEMONSTRATION LENS SET, GLASS. The set contains six 50 mm lenses, one each of double convex, plano-convex,concavo-convex, double concave, plano-concave, and convexo-concave lens. Comes in a reusable cardboard storage box. Lenses in all sets have focal lengths on 150 mm.