CST Berger Manufactures Top-Quality Products for Land Surveyors, Building Contractors, Engineers and any profession that's related with the construction industry. The CST/berger Magna-Trak Magnetic Locator is a proven tool for location of underground utilities and materials. If the material has ferrous in it (if a magnet will stick to it), then these Magnetic Locators will find it, depending on depth and mass of the object. Land Surveyors especially enjoy using Magna-Traks for finding rebar and pipe property corners and surveying markers. Water Works people enjoy them for finding ductile iron water pipe and valve boxes that are buried underground. Magnetic Locators are very useful and time saving tools to work with.