The Textile Light Permeability Tester measures fabric transparency by calculating illuminance ratios with/without samples. Features include a 7-inch touch screen, adjustable halogen lamp with cooling, movable light-shielding cylinder, manual/auto testing modes, and wide-range irradiance sensor. Compliant with GB/T 42999-2023, FZ/T 62025-2015, and JIS L 1055-A standards, it ensures accurate quality control for apparel, home textiles, medical fabrics, and technical textiles.