I have done a limited Internet search and do not find a testing device for this use. Can you help?
These meters come out of the coating and paint industry and can be pricy, but I''m sure they will come down in the future, and there may be some less costly imports on the market now that I am not aware of.
One company sells a gloss meter for $1,200, but I paid $350 for one that looks exactly the same, so more searching may be needed.
I''ve also seen a mechanical thickness gauge that is relatively inexpensive, but I''m not sure of the source for it. I actually got it free at a trade show; again, it comes out of paint industry.