The Fisher Labs M101 Rebar Locator and Metal Probe was designed specifically for finding reinforcing bars and other metal objects embedded in concrete, conduits, PK nails, wiring, wall studs and other metallic objects. The M-101 will respond to all types of metal (rebar, wire mesh, metal conduit, metallic trash, metallic targets on the opposite side of surface to be scanned, etc.) Using a small search coil that provides a concentrated search signal, the M-101 offers accuracy to 1/4 in. of the centerline of the rebar. For most operations, only the penetration control needs to be adjusted to allow maximum penetration depth for metals. A preset circuit eliminates ground effects caused by highly mineralized materials and false signals due to loop movement.

The M-101 also can effectively locate small metal items carried on or within a person and is substantially more sensitive than the average low cost metal detectors used at airports, so that a given metal item can be found at a greater distance from the search loop itself. Searches in water may be up to the control box, as the search loop and cord are waterproof.