The relative humidity probe method, also know as the RH test or the "in situ" test has been in use in Europe for over twenty years, but is relatively new to the United States. Published by ASTM in 2002, this test is known as ASTM F 2170, Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs Using In Situ Probes. This method involves drilling holes in the concrete to measure the dampness inside. Here are some common questions and answers about this method.
What equipment is needed?