hp-4.0 concrete permeability apparatus, concrete impervious tester mainly used for determining impermeability property and impermeability grade ofconcrete specimen. this model concrete impervious tester is used to test the concrete impervious performance, it’s widely used in construction company, research institution, design department, also it can be used for ventilation property test and quality inspection of other construction materials. it's kind of common concrete testing equipment.technical parameters： 1,max.pressure: 4mpa 2,specimens:6pcs 3,power:380v. 50hz. 120w