Not to put it too bluntly, but there isn’t one. MVER refers to Moisture Vapor Emission Rate and is determined by calcium chloride testing. A traditional “moisture test”, MVER is regulated by ASTM F1869 and has proven to be an unscientific and problematic test method, primarily because it tests only the surface conditions of a slab. In fact, calcium chloride testing has been specifically disallowed for lightweight concrete applications.
RH testing for concrete determines internal moisture levels of a concrete slab at 40% of its depth, as is covered in ASTM F2170. Because of the natural drying process of concrete, only accurate RH testing can determine the final moisture conditions of a slab if it were sealed (i.e., a floor covering installed) at that point in time. Our Rapid RH L6 is the latest in field-tested, scientifically-backed, industry-proven RH testing for concrete and flooring professionals.
You can learn more about the differences between RH testing and MVER at www.f1869.org.