It is very easy to tell which mesh sheet is the higher grade.
If you overlap the sheet and slide it back and forth and hold it up to a light and look at it, it will create a "Moiré pattern".
The "Moiré pattern" (Dots) that look the smallest (closest together) is the mesh sheet that is...
You should be able to find your answer in this thread.
http://www.e-cigarette-forum.com/forum/provape/170051-black-chrome-provari-pics-2.html#post2830421
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