There is some new equipment out. Its called the "wagner rapid RH" within the first 15 minutes of installing a Rapid RH™ Smart Sensor into a hole, (hole is drilled and sensor put into place) you will have a relative humidity reading that will give you a very good indication, to within about 3%, of what the final, documentable reading (at 72 hours according ASTM F2170) will be. (thats a RH reading) Here is a link for more info- http://www.wagnermeters.com/concretemoisture.php
