The Rapid RH® L6 concrete RH testing system from Wagner Meters improves upon the already popular 4.0EX system with more digital functionality for an easier, faster and more reliable ASTM F2170 test method. Rapid RH makes it easy with simple steps for sensor insertion, acclimation and obtaining readings. Get instantaneous readings with no additional sensor acclimation required. The Rapid RH L6 interfaces with the DataMaster® L6 app to print and email reports.