followed .Pin and pinless side by side:  Large areas can be scanned fast and easy. Selectable measuring depth 1/4″ or 3/4″ allows for comparing moisture close to the surface and deeper down. Once a problem is detected, pin electrodes can be used for further investigations .RH mode: Add RH Blue Peg humidity probe to the Accurate Weighing Scales -Versa Tec and you have a precision thermo-hygrometer for RH, T, GPP, DPT. Add RH concrete accessories to perform in-situ moisture tests in concrete. RH Blue Peg system complies with latest ASTM F-2170 standard.