Sun YOBA Pro Solar Auto Darkening Welding Helmet Arc Tig Mig Mask Grinding Welding Mask #1 This Auto-Darkening welding Helmets are designed to protect your eyes and faces from spark, spatter, and harmful radiation under normal welding conditions. It can effectively improve the efficiency of your work, release you hand from holding the helmet while working. Large viewing windows-92.5 x 42.5mm. Can clearly see the object you are welding also protect your eyes against UV and IR light. In full conformity with CE Marked: EN: 175/379 - CSA: Z94.3 - ANSI: Z87.1. Ideal for ARC/MIG/TIG/Stick Welding. Fast response time at 0.15ms~0.2ms,retention time takes 0.4ms~0.8ms. Delay time:0.1S~1.2S. recovery time takes 0.1S ~ 0.8S Light State:DIN4. Dark State:DIN9~ 13. Variable shape contol C The Shade can be adjusted from shade 9 to 13 based upon the Welding Process or Application (refer to Shade Chart) The variable shade control knob is mounted on the outside of the Helmet Shell.