Helium mass spectrometry leak detectors are instruments for rapid localization and quantitative measurement of leaks in sealed containers. The helium mass spectrometry leak detection method is characterized by high detection sensitivity, fast detection speed and wide range of application compared to methods such as bubble identification, pressure decay and halogen leak detection. In addition, helium mass spectrometry is safe and reliable because the inert gas helium, which is non-toxic, non-destructive and lightweight, is chosen as the exploratory gas.