Auto darkening welding helmet.Lower price,higher quality and high effective to protect users. Auto darkening welding helmets, Filter size(mm)110*92*11mmView windows size(mm)90*45mm/91*40mm/98*40mm/98*45mm.Ultraviolet ray transmittance rate313365nm<3.4*10-6%Infrared ray transmittance rate7801300nm<0.0027%13002000nm<0.0097%Dark shade rangeDIN913 varibbleLight shade numberDIN3Working temperature-10+ ...