PATIKIL 2" (50mm) Focal Length Double Convex Lens, 3 Pcs 30mm Diameter 5mm Height Glass Optically Polished Round Edges Lens for Physics Experiment, Clear PATIKIL 2" (50mm) Focal Length Double Convex Lens, 3 Pcs 30mm Diameter for Physics Experiment, Clear...

15 insect specimens,Real Specimens of Various Butterflies and Beetles Made of Resin, Used for Science Classroom Science Education Animal Specimens, Bug Preserved,Oddities, Biology (15 Pcs Beetles) 15 Real Insect Specimens of Butterflies and Beetles, Resin Preserved for Science Education, Biology...

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Amlong Crystal 4 inch Optical Glass Equilateral Prism for Teaching Light Spectrum Physics and Photo Photography Prism, 100mm Amlong Crystal 4 inch Optical Glass Equilateral Prism for Teaching Light Spectrum Physics and Photography Prism Length (3 pc): 2.5 inch/60mm; 4...