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K9 Crystal Optical Glass Triangular Prism, 30 * 30 * 60mm Triangular Prism K9 Optical Glass Triangular Prism For Teaching Light Spectrum
Triangular Prism K9 Optical Glass, RGB Light Refraction Teaching Tool, 15x15x15mm or 20x20x20mm Science Experiment Prism with Red Green Blue Light Dispersion for Physics Study and (15*15*15)
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