The SubSurface Instruments Inc manufactures Ferromatic Magnetic Locators for locating things like rebar and pipe property corners, ductile iron pipe, manhole lids, and valve boxes. Subsurface Instruments also manufactures underground utility location equipment for locating underground utilities such as water pipe, electrical cable, telephone cable, and sewer lines by use of a sonde. SubSurface Instruments makes cable location equipment, magnetic field measuring, reporting equipment, and water leak detection equipment. EngineerSupply is a Factory Authorized Subsurface Instruments Dealer.