3M Speedglas Adflo (HE) 9100XX and Hard Hat 16-0905-SGXX
I've been using the 9002x lens for three years. It worked so good that I bought two of them. This 9100xx however has a defect. When you start working, as soon as this hood heats up a little bit the lens starts to go black, like a broken digital watch. Whe...