The Speedglas welding filter 9100X is made for the professional welder incorporating seven variable dark shade (5, 8 and 9-13) for most type of arc welding. Viewing area 54 x 107 mm Tack welding comfort mode help minimize eye strain during extended tack welding applications By selecting just the right settings for each task, you help reduce eye strain and can improve the quality of every weld. Possible to lock-in any shade, e.g. in the light state 3 when grinding. Delay function to set the dark-to-light opening time. Sensitivity of the arc detection can be adjusted for unsurpassed swithching reliability.