Forney Pro Series auto-darkening welding helmets are designed for experienced welders or fab shop workers who weld for long periods of time on a frequent basis. These helmets are intended for wear on welding jobs that demand performance but provide all day comfort. These user friendly and comfortable welding helmets have increased functionality features which enable longer performance as compared to basic auto-darkening welding helmets. Shell and Headgear Features:Lightweight, high impact, fireproof nylon shell Dual crown strap headgear with multi-directional adjustment for a more comfortable fitQuick-fit, 5-point adjustable geared headband with sweatband mechanism greatly reduces head, neck strain and general fatigue caused by repeated lowering of the helmet during day-to-day welding operationsExternal quick-release button allows users to adjust angle and distance of headgear quickly Viewing Area:10.44 square inches (3.94" x 2.65") viewing areaHigh Definition True Color Clarity for a more natural viewing experienceFour optical arc sensors help protect against the hazards of arc flash. These optical arc sensors also offer the best coverage, especially for out-of-position welding1/1/1/2 optical clarity rating for a clear, crisp and uniform viewing areaUV/IR coating to reduce scratching and discoloration of the lens Performance:Internal shade selector with grind optionInternal stepless controls include both sensitivity (high-low) and delay (min.-max.). Internal controls help minimize the risks of damage to the controls themselves or accidental setting changes while in use.DIN 5 to 8 for low amperage MIG welding or plasma cutting; DIN 9 to 13 variable shade selection (TIG operable to 2 amps)1/25,000 per second switching speedSolar cells with 2-each replaceable 3V lithium batteries (CR2045) and automatic on/off technologyUniversal magnifying lens compatible Compliance:Forney Pro Series auto-darkening welding helmets meet or exceed all related CE standards (DIN and ISO), EN166, EN175, EN379 and ANSI Z87.1 safety standards Replacement Parts and Accessories:55763, Forney Pro Series Outer Protective Lens, 2-Pack55764, Forney Pro Series Inner Protective Lens, 2-Pack55765, Forney Pro Series Outer Protective Lens, 5-Pack55766, Forney Pro Series Lens Kit, 5-Pack (2 Inner Lenses and 3 Outer lenses)55767, 1.0 Diopter Magnifying Lens for Forney Easy Weld, Forney and Forney Pro Series Auto-darkening Welding Helmets55768, 1.5 Diopter Magnifying Lens for Forney Easy Weld, Forney and Forney Pro Series Auto-darkening Welding Helmets55769, 2.0 Diopter Magnifying Lens for Forney Easy Weld, Forney and Forney Pro Series Auto-darkening Welding Helmets55770, 2.5 Diopter Magnifying Lens for Forney Easy Weld, Forney and Forney Pro Series Auto-darkening Welding Helmets55787, Ratchet Headgear for Forney Pro Series Auto-Darkening Welding Helmets.