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


Overall Length55 in (139.7 cm)
Weight2.8 lbs (1.3 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 bar graph indicating polarity and relative strength of signal. Also provides low battery indication.
Operating Temperature-13° to 140° F (-25° to 60° C)
Exterior Sensor TubeAircraft grade aluminum
Warranty7 Years

ML-3L Product PDF