Concrete Impermeability Apparatus is used for the determination of the depth of penetration of water in to hardened concrete specimens under pressure. The system can test 150x150x150 mm cube. Pressure to the sample, up to 12 bar with 0.2 bar precision is generated by compressed air applied to the integral water tank and controlled by a pressure regulator; with a pressure gauge. The penetration of water is measured through the burettes supplied complete with the system. The system comprises impermeability gaskets for every cell. The apparatus has to be fitted with the suitable air compressor.