welder's helmet 9100 Air, auto-darkening filter 9100XXi, and Adflo powered air unit. The special silver front frame 9100XXi allows external control, quick and easy access to grinding and memory modes. Can be locked in any shade, e.g., in light state 3, during grinding. Adjustable sensitivity for arc detection. Improved optics in the new 3M™ Speedglas™ welding cartridge 9100XXi ensure greater contrast and naturally appearing colors. Seven variable darkness levels 5, 8-13. Excellent performance in the TIG welding method and extra-large viewing area. Switching time (light to dark) is 0.1 ms. Adjustable sensitivity for arc detection. With the correct type of filter, the Adflo unit is an effective protection against particles and gases - all in one system.