ML-3S (40″)

Magnetic locator offers durable one-handed operation that’s 100% waterproof.

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. 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.

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


Additional information

Overall Length

40 in (101.6 cm)


1.8 lbs (0.8 kg)

Input Power

Three (3) standard 9-volt alkaline batteries

Battery Life

≈ 40 Hours


16.5 kHz


Speaker pitch increases in frequency proportional to gradient field intensity


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


7 Years


Dimensions: 44" x 4" x 4" Weight: 4 Lbs.