Control from a simple fountain pen

In order to find various fastening elements in the wall: nails, bolts, studs, frame, it is not necessary to have expensive metal detectors or other search equipment in stock. There is a way much simpler and faster, not requiring large expenses, which will be available to everyone. I think that for some, this method may come in handy, maybe not right now of course, but someday ... It will be needed To search for fasteners from ferrous metals, we need: An ordinary thread of 1 m. Read More