The principle of operation of the metal detector and concealed wiring resembles the operation of the radio. The wires under tension here play the role of radiating antennas, and the device catches their radiation. Schemes of such DIY can be found on the Internet, but for their work it is necessary that wires were under current. More complex devices work on the principle of detector, and find hidden wiring regardless of whether there is electricity in it or not. In addition, such a device is useful for the search of iron fittings, water pipes and other hidden metal elements. This type is both a receiver and a transmitter and works by analyzing the level of the reflected signal.
When choosing this type of measuring instrument, pay attention to the depth at which the device is able to recognize the desired elements. Many domestic models are characterized by a low depth of scanning, which you will constantly miss.
Find out what kinds of metals are able to "discern" your device. Sometimes the manufacturer "forgets" to mention that his device does not detect non-ferrous metals-in this case, copper and aluminum pipes will remain invisible to you.
The last thing to pay attention to is the distance between the two pipes being taken as one object. The greater the sensitivity of the device, the more chances you have to get between the closely positioned elements rather than one of them.
Digital cable selector
The new model of Fisher TW-82 Digital sites, using only one operating frequency, and provides an easy and fast track cables and pipelines. And run the utility with one button. Send TW-82 automatically determines the signal level sent depending on the State of the conductor and the Earth, and the signal level on the screen. Reception view displays information about the direction of the line deviates, and depth, and signal level. Made specific housing weatherproof plastic impact resistant.