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http://www.xzbelec.com/products/light-transmittance-meter/

As a professional light transmission meter manufacturer,XZBELEC Technology has researched and designed the LS117 used to test the optical density of aluminus plating film, milky translucent materials and arenaceous materials,the LS110 Split Transmission Meter used to test the transmission of front windshield and the LS116 high-precision light transmittance meter used to test thick material.