This equipment is based on differential pressure method and used to measure Gas (O2, N2 or CO2) transmission rate as well as solubility coefficient, diffusion coefficient and permeability coefficient of flexible materials. It is equipped with 3 test cells for different specimens with independent results. This test instrument conforms to the following standards: ISO 15105-1, ISO 2556, GB/T 1038-2000, ASTM D1434, JIS K7126-1, YBB 00082003.