SubSurface Instruments – ML-3 LONG (55″)


Long 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 long is 55″, making it the longest magnetic locator on the market. It allows you to make the biggest sweeps possible without compromising on accuracy. The ML-3 long provides ergonomic, lightweight, durable, one-handed operation option to traditional magnetic locators. It offers unparalleled durability, as all components are housed inside the aircraft-grade aluminum monotube units.

But don’t let its looks fool you. It’s 100 percent waterproof up to 220 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.


  • Low battery indication with flashing LCD
  • Varying pitch audio signal mode using a moving coil speaker for enhanced audio output
  • 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
  • Includes soft case with carrying straps and inside pocket for batteries and manual; Optional aluminum hard case available
  • Rugged construction for field conditions
  • Detection of buried ferrous metal objects at depths up to 8 feet Hand gun: One to two feet 175mm projectile: Four to five feet Water standoff valve: Six to ten feet
  • Detection of ferrous metal objects and weapons on persons
  • Underwater search and detection of: Submerged vehicles UXOs and mines Salvageable wrecks Pipes and cables
  • Over 3500 ML-3 units in Afghanistan used for detection of improvised explosive devises (IEDs) and Unexploded Ordnances (UXOs)
  • Made in the USA – Built and serviced entirely in Wisconsin