Reliability of RH Testing Using Removable Proves vs. Insitu Probes?

[Travis L]

I would suggest getting a copy of F2170 (http://www.astm.org/Standards/F2170.htm). Section 10 specifies 40% of a slab drying on one side and 20% of slab drying on both sides which is then followed by:

"Testing AT these depths will indicate the potential equilibrium relative humidity that will be established within the concrete slab after a low-permeability floor covering is applied."

it doesn't sound like "an average of the RH through the entire depth of the drilled hole" is what they mean.

by the way,there is no reference to 75%RH in F2170.