Current limit resistance should be installed when you do cable test.(You can not install current limit resistance when do other tests)     The user should pay attention that the Control box and Voltage Multiplier should be connected to the earth well during the test,and the discharge of the items and Voltage Multiplier after the test. We remind you repeatedly in order to ensure personal safety.   You should often check whether the fans operate normally if the Control box has fans in order to prevent the entry of other things.      Please clean Voltage Multiplier with a dry cloth when it is polluted by oil.Do not use organic solvents such as alcohol, gasoline to scrub it. You can clean the surface with detergents and dry it by winds before use.Please put it in the box when it is in transport or not in use.     Please replace by the safety-tube in accordance with the digital on the Current  meter in side of the safty.     Please replace by battery of 9V if the High Voltage Shielding Voltage meter displays "LOW BAT" on the table in order to avoid measurement error.     Do not open the control box and the Voltage Multiplier,otherwise it will affect product warranty.We will not be responsible for demolitions if you open them without permission.     The product should avoid of rain erosion、 collisions and crashes when it is in transport.