Sewerin Metal Detector M-130 - Valve Box / Meter Box LocatorMetal detector for locating concealed objects in the supply network Not all metal detectors are created equal Cheap metal detectors have a wide search field which radiates outward causing many spurious false positive hits from fences, cars, buried cans and cigarette wrappers; they are also affected by overhead transmission lines and changes in humidity. On top of all this they also demonstrate a tendency to break when thrown around in utility