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SubSurface BHG Bore Hole Gradiometer

Subsurface’s Bore Hole Gradiometer (BHG), when lowered into a drilled boring hole, is designed to locate ferrous metal in the ground. Equipped with a bull-nosed titanium sensor, control box, and sensor cable with Amphenol connectors, the BHG’s control box will notify the user when ferrous metal is found. Similar to a magnetic locator, the BHG can be used underwater. In addition, this BHG was built tough; as such, it is perfect for many applications, including utility companies, construction, and bridge builders.

Additional product info

Product details

  • Heavy-duty sensor cable acts as lanyard. 30’, 50’, 100’ (non-standard lengths available)
  • High-quality connectors and “toilet seat” cover over headset jack. “Seacon” connectors available.
  • Alligator clips for 12v auxiliary power.
  • Gel-cell auto-charges when auxiliary power connected.
  • “Zero to “null” gradient.
  • Permanent gel-cell battery-mounted under electronics panel.
  • Bull-nosed and tapered sensor on BHG; longer sensor on MUL for diver or boat towing.

Package includes

  • Wall transformer
  • Rechargeable sealed lead acid battery (internal)
  • 12 Volt auxiliary power cable
  • RS-232 Cable
  • 30’ Sensor cable
  • Instruction Manual


Key Features

The BHG (Bore Hole Gradiometer) is comprised of three important parts: the bull-nosed titanium sensor, control box, and sensor cable with Amphenol connectors. Together, when the sensor is lowered into a boring hole, the unit will sense any ferrous metal that may be present.


Some features include a heavy-duty sensor cable, which can act as a lanyard, with alligator clips for 12-volt auxiliary power. The sensor on the BHG is bull-nosed and tapered. The permanent gel-cell is battery-mounted under the electronics panel, and auto-charges when connected to auxilliary power.


The BHG can be used underwater, and as such is well-suited to many applications in construction.


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