Try to select a screwdriver power should be selected to be suitable for the type of power that will be used as a pressure of electricity and
3.1 type of electrical power such as direct current DC (used car) alternating current AC (use the power that comes from the electric shock, etc. )
3.2. voltage must be good not too high or too low if you select a screwdriver with a low pressure may be sensitive, but it is not safe, is to feel that there is Light Leakage through a screwdriver more time touch such as electric power house 200 - 250 V80 - 125 volts, etc.
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