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Optical glass K9 Double convex lens diameter 30mm focal length 100mm mini magnifying glass teaching experiment tool

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Double Convex Glass Lens Optical Lens for Scientific Experiment Laboratory 50mm Diameter 100mm Focal Length

Double Convex Glass Lens Optical Lens for Scientific Experiment Laboratory 50mm Diameter 100mm Focal Length

Double Convex Glass Lens Optical Lens for Scientific Experiment Laboratory 50mm Diameter 100mm Focal Length

Double Convex Glass Lens Optical Lens for Scientific Experiment Laboratory 50mm Diameter 100mm Focal Length

Double Convex Glass Lens Optical Lens for Scientific Experiment Laboratory 50mm Diameter 100mm Focal Length

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