How do auto-darkening welding helmets work?

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How do auto-darkening welding helmets work?

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Auto darkening welding helmets immediately change color in the welding lens at the point of an Arc strike protecting your eyes from UV/IR rays and flashes preventing them from possible visibility damage. The welding face mask also protects you from possible hot metal flying from an ARC. LONGEVITY offers auto-darkening helmets with extremely fast response times, fully adjustable sensitivity settings, and extremely comfortable design with the ability to adjust the welding helmet perfectly to the size of your head. LONGEVITY is also the only company to produce a fully automated welding helmet that fully adjusts to the ARC without having to worry about selecting the sensitivity and response time. In addition to the nice design, LONGEVITY welding helmets offer a locking mechanism to prevent your welding helmet from falling when it is pulled in an upward position. Most welding helmets on the market once pulled up do not stay up, but LONGEVITY has created a locking mechanism to insure your we