... on the principle of photoelectric effect & D65 light source (R457) and with 0/d or d/0 ... Such as: powder, board, paper, paste, sheet, clay, etc.² Chemical & Building materials industry: White Cement (powder), Paint (pasty), Coating (pasty), Plastic (boards ... Factory (paper/sheet), Publishing Company (paper/sheet), etc² Textile industry: Fabric (sheet), Gauze (sheet), Weaving factory (sheet), cotton ...