It is used for the quantitative detection of the vacuum degree of the interrupter of the vacuum switch. With the quantitative measurement method, it can not only measure whether the vacuum degree of the vacuum switch is within the normal range, but more importantly, for some vacuum switches with a faster leakage rate, they can pass The analysis of the measurement results over the years can roughly infer its life span, which really serves the purpose of preventing accidents. The instrument is compact in structure, light and small, fast in test speed, stable and reliable, with higher precision and more complete functions.