Test wires, receptacles and other electrical equipment by pressing the tip of the circuit tester to the item to be tested and noting whether the bulb in the handle lights up. If the bulb does not light up, then that electrical piece is not "hot."Continue Reading
Although these types of testers look a little bit like screwdrivers, they cannot really be used as a screwdriver. These circuit testers are easy to store in a tool box or a tool belt.