This faithfull voltage detector is a handy instrument that uses a safe non contact method to detect ac voltage in outlets lighting fixtures circuit breakers wires and cables and can be used to find circuit breaks in a wire a voltage test is easy to carry out by simply holding the detector by its body and placing the white end cap near or onto a cable or fitting believed to be carrying electricity the detector tip will light up red if a voltage is present the tester can be used to detect voltage