The insulation resistance tester followed the requirements of standard IEC60598 and etc. It has a wide available test range of 0.03 to 1000 mega-ohms with output voltage range of 25 to 1000 volts. The leakage current tester followed the requirements of standard IEC60990, IEC60335, etc. It can make measurements of touch current and protective conductor current. The earth continuity tester is used to perform earth continuity tests on class-I devices in various standards such as IEC60335, IEC60950, etc. The withstanding voltage tester followed the requirements of standard IEC60335, IEC60950, etc. It performs test with maximum AC/DC voltage of 10kV.