What you need know before hang a shelf
If you need to hang a picture or a shelf, then make it simple enough. But if you do not want to hear the roar of the middle of the night, then come to this work with the necessary responsibility. The shelf can fall under its own weight because the plaster walls are not strong enough to sustain the weight of large objects that are mounted on it.
To securely attach the shelf on the wall need to find a stud behind the wall. If you do not have the necessary tools, you can use an old trick. With the help of tapping on the wall at a hearing to determine where the sound becomes less deaf and there is a stud. Such methods are obsolete in the past and are replaced by modern electric instruments.
Stud sensors are divided into several categories. The simplest are inside neodymium magnet that can detect metal objects behind the wall. The second group of devices that allow finding wooden and metal beams behind the wall. And the professional tools that can detect any objects behind the wall including plastic pipes at a depth up to several inches. For choose best model you can read top stud sensor review
Definition of the object of any material, which is located behind the wall is made possible through the use of innovative technologies in the stud finder. In new stud finders used ultrasonic radar like model Bosch D-TECT 120
Micropower impulse radar has a considerably greater range than capacitive technology — between several inches and several feet deep. But finding studs is not the only planned use of the technology. It may also be used, among other things, for locating steel reinforcement in concrete pilings, as part of an in-vehicle device to warn drivers of vehicles in their blind spot and to help find people inside collapsed buildings. That is all a far cry from banging picture hooks into walls, but it all boils down to the same technological problem of finding something in a space you can’t see (http://www.nytimes.com/2001/04/12/technology/how-it-works-detectors-can-find-just-the-right-spot-to-drive-that-nail.html)