Materials Testing
    Detector / Locator for valves and metal boxes

Detector / Locator for valves and metal boxes

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Why buy from Geneq? - find out more

Fisher M-66 Valve and Box Locator is designed specially for finding buried or paved over valves, box's or vaults. In addition, the M-66 locates survey markers, water or gas meters, conduit, manholes and any other concealed metallic object. The M-66 detects all metals including aluminium, brass, copper, iron, nickel, steel or tin. Combining sensitivity and accuracy with maximum ground penetration, the M-66 eliminates any guesswork when pinpointing hidden metallic objects. The electronic balances of the M-66 is easily and quickly tuned for detection within seconds while also allowing for maximum audio and visual indications. In the Fisher tradition, the M-66 is affordable, tough, and simple to use while providing maximum performance. A two year limited warranty comes standard with the unit.


  • Simple Operation- only 2-knobs
  • Ultra-Sensitivity and maximum penetration through soil, asphalt or concrete
  • Ground rejection VLF (very low freqyuency) eliminates false signals
  • Detects all metals
  • Built-in battery test
  • Analog meter and audio target signal
  • Adjustable shaft
  • Fully submersable 8 inch search coil
  • Weather resistant design



Search loop configurationDouble D (Direct Wired)
Output freqency of loop4.5kHz,
Output indicationSpeaker 16 ohm impedence
audio frequency 450Hz
Power Supply9 V, each
Power Consumption(-9V)
4mA min, 6mA sound
Threshold, 125mA, max sound
Weight with 8" coil4.25lbs
Operating Temp-4° to +158° F(-20 to +70°C) search loop immersible in water
Dimensionslength 28" to 48" adjustable (71 cm to 122 cm)
Shipping Weight7 lbs
Shipping Dimensions34.75" x 12.75" x 5.25"



2- Year Warranty

Fisher Warrants the M-101to be free of defects in materials 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. See your distributor for details.