Usually, digital detectors rely on electric or magnetic sensors to detect studs behind the wall. Depending on the type you choose, you can find metal, wood, timber, pipes, leaks, or even motion like pests or rodents. For example, you can buy stationery magnetic detectors that detect nails or screws, which helps while putting the walling material. However, the efficiency of these products can be less when the fasteners are deep into the wall. You should be careful about all these while shopping for one.