From now youl not have this problem! With this app, you have to simply place the phone on the part that you have to drill, press a button and you will be warned of the presence of obstacles behind the wall, so you can drill safely! The app detects electrical wires, metal plates, hydraulic pipes, facilities maintenance, and more! Your iPhone becomes an indispensable companion to carry out the work of every day! Before you make a mess, download this app! The app works with the magnetometert on the iPhone. At normal, this component is suitable for the operation of the compass. Our app exploits it to capture the distortion of the electromagnetic field generated by hydraulic pype, metal parts, various cables inside the wall and warn you of the presence of an obstacle at that point, so you can avoid damaging them!