This Velleman K7102 Metal Detector Electronic Solder Kit will tell you when a electric cable, gas line or water pipe is present. With the K7102 handy metal detector kit, you can now determine beforehand whether there are metal objects to be found in a wall, ceiling or floor. An LED indicates if a metal object is in the vicinity. If an audio signal is also desired, space has been provided on the PCB for buzzer type SV4/12-S to be connected. The PCB has been specially constructed to fit entirely into to the separately available box type G407.