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These Helium Neon Alignment laser safety glasses have a Poly lens that has an optical density of 5+ at the 190-380nm wavelength, an optical density of 2+ at the 633nm wavelength, and a visible light transmission of 36.6%.
Optical Density 5+ @ 190-380nm
Optical Density 2+ @ 633nm
36.6% Visible Light Transmission