CONCRETE SURFACE RESISTIVITY METER

Measurement of concrete surface resistivity has proven to be an efficient & cost effective non-destructive testing method to evaluate state of corrosion, chloride diffusion rate and permeability in concrete samples. The FW411 is a handheld instrument for accurate measurement of concrete surface resistivity using the Wenner 4 electrode method. The FW411 is comprised of a four contact probe equipped with spring loaded stainless steel pins and an electronic processing & display module. The FW411 probe is available in 38 mm & 50 mm contact spacing versions to match current penetration depth requirements in different applications. Generally Larger contact spacing gives more reasonable results in inhomogeneous materials like concrete. The 38 mm probe complies with AASHTO TP 95-11 standard to evaluate chloride ion penetration.jh