I didn’t buy it at the market, in order to find wiring in a panel house so as not to hurt the wall when drilling. Unfortunately, he could not find the regular wiring, but he found wiring and wiring that the residents had already done (apparently it was not deep under the plaster). At first I was dissatisfied with the purchase and rented a device from Bosch, which costs several times more, and so the result was completely identical. If someone makes noise on everything on the wall, just put your hand on this area to remove the pickup + this effect can be given by a power tool plugged into a power outlet