Model M-101 Rebar Locator w/3-1/2" coil, by Fisher

Finds reinforcing bars and other metal objects embedded in concrete. Finds conduit, PK nails, wiring, wall studs and other metallic objects.


The Fisher M-101 metal detector was designed specially for finding reinforcing bars and other metal objects embedded in concrete, conduits, PK nails, wiring, wall studs and other metallic objects. Users may expect accuracy to 1/4" of the center line of the rebar.

Turn the instrument on, and only the penetration control needs be adjusted for most operations, allowing 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 can also 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. The search loop and cord are waterproof. Backed by Fisher’s industrial 2-year warranty.


  • Detects all metals.
  • Accurately pinpoints steel reinforcing bars, or "rebars" in concrete (typically 8-9" depth for 1/2" diameter rebar).
  • Detects intersections of rebar or mesh.
  • Audio and visual indications of nearby metal.
  • Rugged construction.
  • Operates on universally available 9V batteries.
  • Quick tune ready for operation in seconds.
  • Fully waterproof search loop.
  • VLF (Very Low Frequency) operation.


2-Year Warranty

Fisher warrants the M-101 to be free of defects in material and workmanship when it is shipped from the factory. The terms of this warranty are fully explained in a warranty registration card that accompanies the instrument. Complete factory and field service facilities support the warranty. Warranty may vary outside the U.S. Please see Corrosion Control Products Company for details.

M-101 Specifications

  • Coil Operating Frequency: 4.5 kHz
  • Sensitivity Adjustment Range: 12:1
  • Output Indication: 
    Meter - 1 milliamp, 1-100 linear scale
    Speaker - 16 Ohm impedance
    Headset (optional) - 8 Ohm impedance
    Audio Frequency: 450 Hz
  • Power Supply: 
    +/- 9V, 2 ea. 9V batteries (NEDA 1604)
  • Coil Configuration: Double D
  • Weight: 2.8 lbs (1.3 kg)
  • Dimensions
    Control Box: 3” x 6” x 6” (8 x l2 x l6 cm)
    Handle: 0.75 x 23 inches (1.9 x 58.4 cm)
  • Shipping Weight: 4 lbs (1.8 kg)
  • Shipping Dimensions: 
    26.5" x 6.25" x 6.25" (67 x 16 x 16 cm)
  • Accessories: 
    Search Loop Cover, 3 1/2" diameter, press-on, fitted for the search loop to prevent abrasion.