50x50mm Educational Diffraction Kit Includes Single Slit Double Slit Round Hole

Optical Diffraction Grating Set with Single Double and Triple Slits 50x50mm

Advanced 50x50mm Circular Interference Diffraction Grating Experiment Kit

Comprehensive 50x50mm Circular Diffraction Grating Kit for Experiments

Optical Diffraction Grating Set with Single Double and Triple Slits 50x50mm

Double and Triple Slit Optical Kit Complete with Five Different Pieces

Plastic Interference Diffraction Grating Set 50x50mm for Laboratory Use