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Miller® 2 x 4 inch FS-9 auto-darkening welding lens now features ClearLight™ lens technology. Clearlight™ offers a bright, crisp, clear view of the weld puddle with more realistic color hues in both light and dark states. The FS-9 fits standard 2 X 4 inch lens opening in most major brands of welding helmets and is an outstanding replacement for your existing auto-darkening lens or an excellent upgrade to your standard passive welding lens. The lens has two arc sensors and does not require batteries.