Mainly used in determining the impermeability properties and impermeability grade of mortar and also the determination of impermeability of building materials and quality control, so it’s widely applied in relevant departments of production, construction, design, teaching and research.the same as general ones in functions, has the main characteristic that the pressure value is showed on the pressure indicator through sensor, and it achieves automatic pressure rise and even automatically finishes entire testing according to pre-set procedures as a result of mitigation staff burden.