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Subsurface Instruments ML-3S Magnetic Locator

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  • Description
  • Technical Specifications
  • Key Features
  • Videos & Brochures
ML-3S (40")
Magnetic locator offers durable one-handed operation that's 100% waterproof

The ML-3 is a much-anticipated and welcome addition to the ML family of magnetic locators from SSI. ML-3 magnetic locators represent the best in innovation at work for the water/sewer industry, surveying industry and military.
That's because the ML-3 reflects many of the items on our customers' technological wish lists.


  • IP68 Certified: Waterproof tested to depths up to 250ft.
  • Weight: 1.8 lbs including batteries
  • Overall length: 40 inches
  • Audio: Speaker pitch increases in frequency proportional to field intensity.
  • Visual: LCD display with bar graph indicating polarity and relative strength of signal.
  • Input Power: Three standard 9-volt alkaline batteries
The ML-3 short is 40" to meet surveyors' personal preference, providing an ergonomic, lightweight, rugged, one-handed operation option to traditional magnetic locators. The ML-3 offers unparalleled durability, as all components are housed inside the aircraft-grade aluminum monotube units.

But don't let its looks fool you. The ML-3S is 100 percent waterproof, IP68 certified up to 250 feet - a first for the industry - so it can be used in difficult weather and submerged under water. Plus, its auto-zero feature allows the user to "cancel" ambient magnetics or magnetic gradient in the soil or water. And it's digitally tuned, so it offers unparalleled accuracy in detecting ferromagnetic objects.


  • ML-3 Magnetic Locator
  • Soft-pack custom case
  • Instruction manual
  • 1 set of 9-volt batteries
Made in the USA and comes with a 7 Year Warranty!

  • ML-3 Locate by Fence Strategy Brochure
  • ML-3 Spec Sheet
  • ML-3 Manual

    • Technical Specifications

      Overall Length: 40 in (101.6 cm)
      Weight: 1.8 lbs (0.8 kg)
      Input Power: Three (3) standard 9-volt alkaline batteries
      Battery Life: ≈ 40 Hours
      Frequency:  16.5 kHz
      Audio: Speaker pitch increases in frequency proportional to gradient field intensity
      Visual: LCD display with a bar graph indicating polarity and relative strength of the signal. Also, provides low battery indication.
      Operating Temperature:  -13° to 140° F (-25° to 60° C)
      Ingress Protection: IP68 Certified up to 250 feet
      Exterior Sensor Tube: Aircraft grade aluminum
      Warranty: 7 Years
      Shipping: Dimensions: 44" x 4" x 4"  Weight: 4 Lbs.

    Key Features

    • Detection of buried ferrous metal objects at depths up to 8 feet or more 
      • Handgun: One to two feet 175mm 
      • projectile: Four to five feet 
      • Water standoff valve: Six to ten feet
    • Varying pitch audio signal mode using a moving coil speaker for enhanced audio output 
    • IP68 Certified, waterproof and complete protection against sand, dust, and dirt
    • Waterproof sensor tube pressure tested to water depths of up to 250 feet 
    • Easy-to-use, one-handed operation with four-button keypad: 
      • On/Off button: Turns unit on or off
      • Zero button: Automatically calibrates unit to ambient magnetic conditions 
      • Gain Up button: Increases the locating sensitivity of the unit 
      • Gain Down button: Decreases the locating sensitivity of the unit 
    • Rugged construction for field conditions 
    • Low battery indication with flashing LCD
    • Includes soft case with carrying straps and inside pocket for batteries and manual; Optional aluminum hard case available
    • Underwater search and detection of Submerged vehicles UXOs and mines Salvageable wrecks Pipes and cables 
    • Made in the USA - Built and serviced entirely in Wisconsin

    Videos & Brochures

    Super Durable   Waterproof to 220 Feet!

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