A very useful instrument for tracing pipes, detecting nails and screws etc. in walls. In addition to detecting metals it can also detect electric cables that are connected to the mains even if no current is flowing. To distinguish between metal objects and mains cables an LED indicator and buzzer will give a continuous tone and light for metal objects and an intermittent tone and flashing light for mains cable. The detector is housed in a tough plastic case and is powered by one 9V PP3 battery (Order Code AR46).