Mode toggle switch to set "Weld, Cut or Grind" mode. When "Grind" mode is set the lens will not respond to any arc.
THIS MODE IS FOR GRINDING ONLY. Set back to "Weld or Cut " as soon as finished Grinding to avoid accidental flash. When mode toggle switch on "Cut", The "Shade" dial then have the range "5-9". When mode toggle switch on "Weld", The "Shade" dial then have the range "9-13".Latest version welding helmet, meets the safety and technical standard of ANSI Z87.1 / EN379 CE / CSA Z94.3. Lenses Give an Unprecedented 180° Field of View. No need to replace the battery.