The product can effectively find the insulation damp, dirt, and other defects, and through the current and leakage current curve found that the local defects of insulation. Since the DC voltage is divided by the insulation resistance, it is possible to find the end insulation defect more efficiently than the AC. At the same time, due to DC voltage insulation is basically no dielectric loss, therefore, DC voltage on the insulation of the destructive. In addition, because the DC voltage only needs to supply a small leakage current, and thus the required test equipment capacity is small, easy to carry. Perform insulation resistance and withstand voltage testing in a single series. Insulation and voltage withstand testing. Safety standards compliance testing. Stores up to 10 sets of test conditions (10 each for insulation and voltage withstand). Voltage comparator functions (voltage withstand testing). Zero V Switching (voltage withstand testing). Electrical Discharge function (insulation testing). Automated testing support. Interlock Protect function and Remote controllable.