What Are Acceptable Moisture Levels In Wood? Flooring contractors use moisture meters to find out ideal situations when installing a flooring over a concrete slab or subfloor. A concrete moisture meter is a sort of moisture meter used by installers of flooring to measure the moisture levels of concrete. http://perth-northern-suburbs-el02221.designertoblog.com/26226155/concerns-for-sub-floor-installation-installation-some-simple-guidelines