Complex sentence: Concrete electrical resistivity can be measured using four probes (wenner array probe), in this method The two outer probes induce the current to the specimen and the two inner electrodes measure the resulting potential drop.
Split into simpler sentences: Concrete electrical resistivity can be measured using four probes in a Wenner array. In this method the two outer probes induce the current to the specimen and the two inner electrodes measure the resulting potential drop.