5pcs Optical Diffraction Grating Set for Laboratory Use Various Slit Types

Interference Diffraction Grating Set 5pcs with Double and Triple Slits

Diffraction Grating 50 Lines Optical Spectrophotometer for Teaching Experiment

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

Comprehensive 5pc Interference Diffraction Grating Set with Various Designs

2mm Thickness Diffraction Grating Suitable for Laboratory Use and Education

Interference Diffraction Grating Set 5pcs with Double and Triple Slits