Leakage tester is designed and manufactured according to GB/T 15171 and ASTM D 3078, and applicable in airproof test of foodstuff, pharmaceuticals, daily chemistry and other industries. Users can efficiently compare and estimate the airproof property and seal technique of flexible packages by test. It can offer scientific data of what is useful in estimating whether the relative technical requirement is suitable. It can also do airproof test of packages having done falling and press tests. This equipment employs compressed air, vacuum producer, and high accurate pressure sensor. Micro-computer controls it to realize the performances of fast vacuumizing, high accuracy and digital parameter setting. Pneumatic system elements are the best of the world.