PVC coated fiberglass screen, mainly in two color: Grey and charcoal(black)

18x16 mesh, 0.011". used for window screens and screen doors. Uses .011"(0.28mm) Diameter threads

with 18 threads per inch vertically and 16 threads per inch horizontally.

Width up to 108"(274cm)

Length up to 600'(183m)

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18x14 mesh, 0.013". a stronger mesh , recommended for larger openings such as porches, pools and patios or

where added strength is desirable. Made with .013"(0.33mm) Diameter threads

with 18 threads per inch vertically and 14 threads per inch horizontally.

Width up to 108"(274cm)

Length up to 600'(183m)

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Tear the screen with your fingernails.Bad quality screen would be teared apart easily.	Jab the screen through with a pen, you could compare the different strength.
Beside that, you could also test the quality by smell, and by looking at if there is uneven spacing.