How is the thickness of the flexible liner measured?

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Dmitry

Minister of Fire
Oct 4, 2014
1,200
CT
I recently got the Roundflex liner that according to the brochure is .018 " thick. When I measured it with a caliper it showed 0.1 005 in or so.
Can someone explain it, Please? Thanks.

[Hearth.com] How is the thickness of the flexible liner measured?