Floor failure over concrete subfloors are often caused by excess moisture levels in the mid section of a concrete floor.  This in-depth moisture cannot be detected with conventional pin and pinless moisture meters. The in-situ RH probes can detect the moisture level at a 40% depth and will accurately show if there is too much moisture in the mid section of a slab. The recently up-dated Lignomat RH system complies with the latest  ASTM standard F2170-11 in placing the RH Probe within the required distance from the  concrete. and restricting the air space, where air can escape upwards  to 5/8”  from the bottom of the

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