Company Profile

We are an experienced team with vast experience designing, developing, manufacturing, marketing and repairing magnetic locators, pipe and cable locators and water leak detectors. Because of our extensive background and work history, we provide the best warranty and product support in the industry.


SubSurface Instruments manufactures underground and underwater magnetic pipe and cable location equipment plus magnetic field measuring and reporting equipment used on land as well as in offshore areas to depths of over 2,700 meters. In addition, we offer a complete line of water leak detection equipment.


With more than 120 years of design, development and customer service experience, our company is built on:



SubSurface Instruments is located in Purcellville, Virginia, near Dulles Airport. Our 8,000 sq. foot facility is designed to deliver quick repair service (and the best warranty) for your old magnetic locators, as well as produce the finest Magnetic Locators and Leak Detectors available.


SubSurface Instruments is part of the MDU Resources Group, Inc. family of companies. MDU Resources (NYSE:MDU) is comprised of electric and natural gas utilities, natural gas pipeline services, natural gas and oil production, and construction materials and mining.

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