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This Newton's Ring Apparatus. 3" frame is made with heavy duty metal with metal screws. Pair of glass plates, glass is optically polished, glass is 60mm diameter, one glass plate is plain, the other glass is a plano-convex. Both are mounted together in the frame. Pressure between plates adjustable by three metal screws.
Started over 50 years ago as a small, family-owned manufacturing company, Eisco now produces over 6,500 product lines for the science education and scientific research markets. They have headquarters in both India and the US, and serve hundreds of distributors around the world.
Their core products include glassware, physics apparatus, biology models & equipment, and chemistry lab supplies. Products are designed by a team of laboratory professionals and engineers with quality and durability in mind.