What’s the #1 misconception with measuring moisture in concrete?

Surface readings don’t tell you what a slab is holding underneath. ASTM F2170 calls for in-situ relative humidity testing at 40% of slab depth for slabs drying from one side. This short video covers the misconception behind surface-only testing and what the standard actually requires.

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What’s the #1 misconception with measuring moisture in concrete?

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