Beijing Aurora Safety & Protection Technology Ltd (ASP) has professional technical background of optical-electric, laboratory, coating centre for R&D and production. ASP is professional manufacturer of Auto-darkening Welding Filter & Helmet. ASP devote to auto-darkening welding filters (ADF) research and production. All products are self-develop and design, adopt single-chip circuit, software control technology and best components. Temperature range compensation makes Shade No. and Switch-time of ADF controlled accurate, low power consumption prolong battery life very well. ASP also designs and product new generation Digital ADF series products which at the edge of the world. Design with four sensors suit TIG welding process admirably. The research production proved by safety test of DIN CERTCO and ECS Germany, Also obtain many Chinese patent and software copyrights. The products have CE certificate issued by DIN CERTCO and ECS Germany and sale to many countries all over the world. Because of the professional technical strength and the highest position of R&D, ASP is appointed to be the constituter of Chinese National Standard “Automatic Welding Filter”. The standard has been approved by Expert Group and will be issued in China. ASP will supply best products with the lowest price.