For welders handling a variety of amperages and arc welding processes, 3M offers the versatile, auto-darkening 9002V Series filters and helmets. Choose from 61 control combinations to guarantee the most efficient and comfortable helmet, no matter what you are welding. The auto-darkening filter lens reacts automatically and instantaneously to the light from welding arcs, while providing outstanding optical clarity. A delay function lets you decide how quickly the filter changes from dark-to-light. The comfortable, lightweight nylon helmet is chemical and heat resistant, and durable. Specially designed vents help remove exhaled air and prevent entry of welding smoke. "V" models have the Standard size viewing filter: 3.57" x 1.68" (for Large view filter, see the 9002X models) Variable shades from 9 to 13, with 4 sensitivity levels and 3 time delay setting SideWindow helmets increase viewing area by over 100% Membrane-covered control buttons are much faster to use than knobs Light shade: 3 Dark shades: user-adjustable to 9, 10, 11, 12 or 13 Operating temperature: 23 to 131F (-5 to 55C) Standards/Approvals: ANSI Z87.1-2003