The NELD-NPR163 Nitrogen Permeability Tester is a product independently developed by NELD based on the GB36900.2-2018 standard "High Integrity Containers for Low and Intermediate Level Radioactive Waste - Concrete Containers." The nitrogen permeability testing method is used to determine the gas permeability of concrete to assess its resistance to gas permeation. The test fixture of the nitrogen permeability tester is made of 304 stainless steel, featuring a high-precision digital display on the collection instrument, a high-pressure rubber bladder, and a digital display soap film flowmeter for high measurement accuracy. The product supports are made with Foma wheels, allowing for horizontal adjustment, support, fixation, rolling, and dust-proofing. The product design is clever and scientific, with easy operation, making it an ideal testing equipment for research institutions and quality inspection agencies.