Surface resistivity measurement provides extremely useful information about the state of a concrete structure. Not only has it been proven to be directly linked to the likelihood of corrosion and the corrosion rate, recent studies have shown that there is a direct correlation between resistivity and chloride diffusion rate. The versatility of the method can be seen in these example applications:

Estimation of the likelihood of corrosion
Indication of corrosion rate
Correlation to chloride permeability
On site assessment of curing efficiency
Determination of zonal requirements for cathodic protection systems
Identification of wet and dry areas in a concrete structure
Indication of variations in the water/cement ratios within a concrete structure
Identification of areas within a structure most susceptible to chloride penetration
Correlation to water permeability of rock

Resipod is a fully integrated 4-point Wenner probe, designed to measure the electrical resistivity of concrete in a completely non-destructive test. It is the most accurate instrument available, extremely fast and stable and packaged in a robust, waterproof housing designed to operate in a demanding site environment.