These argon alignment laser glasses have a poly lens that has an optical density of 2-3+ at the 480-532nm wavelength, and an optical density of 1. 5+ at the 470-555nm wavelength, with a visible light transmission of 34%. Model # LS-AA-55 Features: Optical Density 2-3+ @ 480-532nm Optical Density 1. 5+ @ 470-555nm 34% Visible Light Transmission.
