ISO2813 recommends surfaces measuring mid to low gloss finishes using 60 and 85 deg. Is the flex 20 suitable for measuring these surfaces?

Yes, see table. 60 and 85 give greater resolution of measurement at these gloss levels (small visible differences in finish = a large difference in gloss value)
Whilst 20 has a smaller measurement resolution, visible differences in gloss can be quantified with the Flex 20.

iq flex 20 graph for mid to low gloss finish

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ISO2813 recommends surfaces measuring mid to low gloss finishes using 60 and 85 deg. Is the flex 20 suitable for measuring these surfaces?