I used a Home Depot Lincoln helmet with a fixed peak. And Arc One s540-10 came in with no problems. I also didn't know if it was going to be an HD lens and it was! It was a good deal at the time as I noticed the price has gone up since I bought it. The observation deck size is small for such a large helmet but adequate for my purpose. And I've used it to weld .030 wall stainless steel with very good clarity even at a dark shade of 10. The fact that I could see such low amp welds even on a dark tint makes this lens very versatile for most applications. Also, one of my favorite parts is that it's almost the same thickness as a regular glass lens.
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