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Amazon.com: Fresnel Lens, Diameter 200mm (7.9''), Focal Length 100mm, Acrylic Lens (not Glass), for Physics Classroom,Solar Heating,Magnifiying. (Focal Length 100mm) : Industrial & Scientific
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Amazon.com: Fresnel Lens, Diameter 200mm (7.9''), Focal Length 100mm, Acrylic Lens (not Glass), for Physics Classroom,Solar Heating,Magnifiying. (Focal Length 100mm) : Industrial & Scientific
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Amazon.com: AISITESY Lensometer Focimeter 3.5" True Color Monitor Auto Lensmeter Optics Instruments Digital Lensometer Pd with Printing D900 : Industrial & Scientific
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