It is designed and manufactured according to the GB1038 ASTMD1434 ISO2556 ISO 15105-1 JISK7126-A YBB 00082003. It adopts the principle of the differential pressure method to measure the permeability of the packaging film's oxygen, carbon dioxide and nitrogen gas, etc. The adopted computer control can finish the whole test process automatically. The software design adopts the international advanced processing method of data statistics, with accurate temperature control and moisture analog. The operating interface is concise and literal with easy maintenance. The testing data is accurate and the performance stable and reliable. It is the ideal choice for scientific research and measuring institutions, colleges and universities and packaging plants.