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JW Fishers Proton 4 Magnetometer with 150' Cable Metal Detector

Sku: 569-20
Retail: $12,995.00
Now Only: $11,899.00
The Most Powerful Boat Towed Metal Detector for Ferrous Metals

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JW Fishers Proton 4 Magnetometer with 150' Cable Metal Detector
The Most Powerful Boat Towed Metal Detector for Ferrous Metals

A high performance, micro-processor driven system, the Proton 4 is the ultimate detector for ferrous metals such as iron and steel. The Proton 4 is in use by military, law enforcement, commercial, and salvage divers world wide. Its extremely large detection area make this detector ideal for both commercial operations and professional treasure hunters.

The claim-to-fame of this marine magnetometer is it’s rugged construction, ease of operation and the number of available options. The Proton 4 has one gamma sensitivity, the maximum practical sensitivity for a towed magnetometer. It’s maximum range capability of 1500 feet on each side (3000 ft. total swath for a very large target) lets you cover a wide area quickly and completely. The detection range is unaffected by the medium between the metal detector and the metal target. Performance does not change whether detecting through air, water, silt, sand, or solid coral.

The Proton 4 system includes tow fish with 150 feet of cable, and a top-side control unit. The control unit features easy to read LCD display, audio alarm, and variable sensitivity switch (for pinpointing targets). An optional built-in printer is available which gives hard copy of mag readouts and Loran or GPS position.

Options include 300 foot tow cable, UA-2 altimeter, RS232 data output, data collection and storage software, 500 and 1000’ depth rated versions. The system is powered by a 12 volt battery with a total power consumption of only 40 watts.

Here is a third-generation proton magnetometer with a top performing, micro-processor-driven detection system. Proton magnetometers are the ultimate detectors for ferrous metals such as iron and steel, and are not affected by non-ferrous metals. At a one gamma sensitivity, the Proton 4 is at the maximum usable sensitivity for a towed magnetometer. And with its two second cycle time it gives a strong return signal, fast enough to detect even small iron/steel targets. The Basic unit comes with control box, 150 ft cable and a 300 ft. optional cable, and a fish. The Proton 4 fish can be towed at any depth, at speeds up to 10 mph. The optional printer allows Gammas and Loran/GPS coordinates can be printed out for a permanent record.


  • Warranty : 2 Year Limited
  • Depth : 1,500 ft. Detection Range
  • Construction : Commercial Grade
  • Sensitivity : One Gamma Sensitivity
  • Audio Output : Audio Jack for Headphones
  • Tow Speed : 1 to 10 Miles Per Hour Tow Speed

Additional Information

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JW Fishers Proton 4 Magnetometer with 150' Cable Metal Detector


  • 2 Year Warranty
  • 150 ft. Cable
  • Target Alarm
  • LCD Readout
  • Two sec. Cycle Time
  • One Gamma Sensitivity
  • Built-In Printer (optional)
  • 1,500 ft Detection Range
  • Commercial Grade Construction
  • 1 to 10 Mile Per Hour Tow Speed
  • Loran / GPS Coordinates Printout
  • Can be Converted for Land Usage
  • Faster Towing Speeds than Pulse Systems
  • Ability to Make a Permanent Record of Mag Readouts with Position Coordinates

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