Crystal Clear Blue View Clairvoyant 3.0 Welding Lens Variable Shade

Stainless steel case reflects infrared heat/light and stays cool! Fits in all 2" x 4 1/4" welding helmets, 1/1/1/2 Optical quality according to EN379 Clear State: Shade 3; Dark State: Shade 5 (for cutting), darkest at shade 8-13 for welding Improved solar and lithium battery, designed for faster switching times between shades Ambient light awareness design for "flicker-free" TIG welding All digital, new & improved software for reduced flickering Ultralight and ultrathin, this lens has one of the world's fastest dim switching speeds at 1/16000th of a second Cartridge size: 4.25" x 2" x .197"; Viewing area: 3.8" x 1.38" 1/1/1/2 Optical quality according to EN379 Armour Guard™ Clairvoyant Patent Pending with USPTO