... Voltage Detector Sensor Tester Pen 90-1000V Features:Electric Socket Wall AC Power Outlet Voltage Detector Sensor Tester Pen 90- ... industry uses Ideal design for testing power cables, circuit breakers, wall sockets, junction boxes, fuses, etc Just press the button, ... red flashing LED would indicate the presence of voltage Totally insulated, no exposed metal or conductive parts Long life and low ...