50x50mm Double Triple Slit Diffraction Grating Kit for Science Projects

Double and Triple Slit Optical Kit Complete with Five Different Pieces

Optical Science 5pcs 50x50mm Double Triple Slit Diffraction Grating Set

50x50mm Plastic Diffraction Grating Set with Single Double Triple Slits

5pcs 50x50mm Double Triple Slit Circular Interference Diffraction Grating Set

Circular Interference Diffraction Grating Set 50x50mm for Science Projects

Optical Science 5pcs 50x50mm Double Triple Slit Diffraction Grating Set

50x50mm Diffraction Grating for Slit Interference Research Applications