Product airproof detection significance in industrial production. Multi station GB mechanical seal Beijing leadertech instruments Limited R & D sealing detector, using the differential pressure type dry air leak detection method, accurate, efficient, non-toxic, environmental protection, to replace the manual judgment with automation equipment, improve the detection efficiency and the qualified rate of products GB mechanical seal. Tightness test the devices currently used in military various fuse, also can be modified in the sealing detection of products of other industries.