ZC-504 portable withstand voltage tester is suitable for testing the safety withstand voltage and leakage current of various motors, electrical appliances, instruments and household appliances, as well as the strong current system. The instrument is easy to operate, safe and reliable, with good performance and convenient maintenance. It is test equipment required to meet the test requirements of GB4706.1 《General Requirements for the safety of household and similar electrical appliances》and GB9706.1 《 General Requirements for the safety of medical electric E-Gas》, GB4943, GB4793 and other national standards.