VC-VII vacuum degree tester is the seventh generation of the VC series and inherits the previous functions. The LCD is designed on the panel for users. The number of curves and the corresponding model of the vacuum interrupter are stored in the tester; the user can perform the test without instruction. The tester stored 43 pcs of update curves of interrupters that are corresponding to more than 300 types of overseas and domestic vacuum interrupters. It displays the waveforms of the leakage current and ionization current, from which the clients can judge there is the rod discharge or not in the ionization current.