I don’t know who called this PRO mask - it is clearly not suitable for professional welding, however, as well as for amateur welding. The light filter darkens only the middle with a strip of 20-25% of the entire area. I tested 2 masks - on both such a jamb. Claimed shading 9-13 DIN, but even with full shading "13 DIN" it is much lighter than the mask with glass C5 with shading 11 DIN. In conclusion, this mask is not certified in any way.
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