CCYKXA 2-Piece Voltage Tester Electrical Detector Screwdriver Tester Pen with Neon Tube

The voltage tester is primarily used to detect voltage in cables, wires, circuit breakers, light fixtures, switches, etc. The pen body contains a neon tube; if the neon light illuminates, it indicates the condition of the device. Both slotted and Phillips screwdrivers can be used with the electrical tester pen. This voltage tester can be used to test if an element is live or to distinguish between the neutral and ground wires. The thumb, middle, ring, and little fingers simultaneously hold the insulating part of the tester pen, the index finger touches the metal cap on top of the pen, and the metal tip of the pen makes contact with the item being tested. When using the tester pen, the neon tube should be backlit so that the red light emitted during the measurement is clearly visible in time.