The main purpose is to check whether there is an air leakage and the extent of the leakage. Airtightness tester is usually also called sealing tester or leakage tester, airtightness leak detector, mainly used in automotive, electronic components, medical devices, food, daily chemicals, pharmaceuticals, stationery, consumer electronics and other industries, packaging bottles, cans, boxes, bags, tubes, etc. sealing test, can also be packaged pieces of sealing quality analysis.