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. 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 the only magnetic locator in the world that 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.


  • 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


Overall Length40 in (101.6 cm)
Weight1.8 lbs (0.8 kg)
Input PowerThree (3) standard 9-volt alkaline batteries
Battery Life≈ 40 Hours
Frequency16.5 kHz
AudioSpeaker pitch increases in frequency proportional to gradient field intensity
VisualLCD 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 ProtectionIP68 Certified up to 250 feet
Exterior Sensor TubeAircraft grade aluminum
Warranty7 Years
ShippingDimensions: 44″ x 4″ x 4″ Weight: 4 Lbs.

ML-3S Product PDF