Good universal detectors are quite expensive, for example, Bosch D-Tect 150 will cost you from 30-35 thousand rubles. But with its help you can detect plastic pipes, electrical wiring, metal pipes and even wooden structures behind the wall. This detector will also show you the exact distance to the object and display its location. There are cheap detectors, for example, Elitech D 80 costs only 2 thousand rubles, but they are much simpler (they ring when they find wiring or metal). All detectors vary in the depth of detection and according to the materials that they find, as well as by ways of displaying information.
