VAC- VBS Gas Permeability Tester is based on differential pressure method and used to measure gas permeability of plastic films, sheeting, paper, foils and etc. This equipment can test 3 specimens with average results in one operation. This test instrument conforms to the following standards: ISO 15105-1, ISO 2556, GB/T 1038-2000, ASTM D1434, JIS K7126-1, YBB 00082003.