Auto-darkening filter with 3M™ Speedglas™ Natural Colour Technology for most types of arc welding Designed for 3M™ Speedglas™ Welding Helmet Series 9100 Viewing area: 73 mm x 107 mm Variable dark shades 5, 8 and 9-13 Light shade 3 Delay function sets the dark-to-light opening time Switching time (light-dark) of 0.1 ms Sensitivity of arc detection can be adjusted for unsurpassed switching reliability