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GR-3 Plus
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GR-3 Plus

£1,600.00

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GR-3 Plus 3D Ground Scanner Metal Detector

If you are looking for a metal detector that goes beyond simple beeps and surface signals, the GR-3 Plus is built for deeper investigation.

This advanced ground scanning metal detector is designed for serious users who want visual confirmation of what lies beneath the soil. Instead of guessing, the GR-3 Plus allows you to scan, analyse, and view underground structures in 3D, helping you detect gold, cavities, tunnels, tombs, and buried metals with clarity.

For anyone searching for the best metal detector UK customers trust for deep ground imaging, this is a powerful and practical choice.

Advanced 3D Ground Scanning Technology

The GR-3 Plus is not a standard gold detector machine. It is a professional 3D visualisation system that detects differences in soil density and magnetic fields.

With its CN-D Dual Sensor Technology (Gradiometer ± 2000 µT), it can:

  • Detect buried metals
  • Identify magnetic objects (iron, steel)
  • Locate non-magnetic metals such as gold, silver, and copper
  • Detect cavities like tunnels, graves, and underground rooms

Unlike traditional gold metal detector models, the GR-3 Plus provides graphical 3D analysis through dedicated Android and iOS software, giving you a visual representation of what is beneath the surface.

Description

In short. The GR-3 Plus is a 3D ground scanner reaching 15 metres, at £1,600. It uses CN-D dual sensor gradiometer technology, weighs 600g, runs about eight hours and sends its data to Android and iOS software for 3D analysis. Two year warranty.

The GR-3 Plus is the middle of the Groundtech range and the one to pick when 7 metres is not enough and £2,249 is too much. What you are buying over the standard GR-3 is depth: 15 metres against 7. Everything else, the processor, the battery, the weight and the software, is the same, which makes the decision unusually simple.

How It Works

Gradiometer, not a coilCN-D dual sensor technology measures magnetic field variation at plus or minus 2000 microtesla. It reads changes in the ground rather than pinging metal.
Tells magnetic from non magneticIron and steel read differently from gold, silver and copper, so the scan separates ferrous clutter from the targets you actually want.
Finds voids as well as metalTunnels, graves and underground rooms show up because they change the ground’s signature, not because they contain anything.
3D output on your phoneThe Groundtech analysis app turns raw readings into a readable 3D image, with object size and approximate depth, and lets you save and review scans.

Specification

  • Scanning depth Up to 15 metres
  • Sensor CN-D dual sensor gradiometer, plus or minus 2000 microtesla
  • Processor 240MHz CPU with 12 bit analogue to digital converter
  • Scanning modes Auto, Manual, Live Scan and Pinpointer
  • Connection Bluetooth 4.2 BLE
  • Software Android and iOS 3D analysis application
  • Weight 600g
  • Operating time Approximately 8 hours
  • Battery 3.7V lithium ion, Type-C 25W fast charging
  • Operating temperature 0C to 70C
  • Storage temperature Minus 20C to 60C
  • Warranty 2 years
  • Price £1,600

Who It Suits

Cache and hoard huntersPeople chasing a single substantial buried target, where knowing the depth before digging changes whether it is worth the effort.
Field archaeologyNon invasive assessment of structures and voids across a site before anything is opened.
Serious prospectorsSurveying ground properly rather than walking it hopefully, which is where the time saving comes from.
Not for coin huntingA coin will never register as a ground anomaly. For that, see our coil machines.

Why Buy From Us

Official UK dealerWarranty handled here, with spares held in the UK.
Honest adviceWe would rather talk you into the right machine than the dearest one.
Free UK deliveryOn every detector, with support from a UK team.
We use this kitThe advice here comes from using these machines, not from a brochure.

The standard GR-3 at £1,300 reaches 7 metres if that is enough, and the GR-4 at £1,750 is the next step up. All of them are on our Groundtech page.

GR-3 Plus Questions, Answered

What is the difference between the GR-3 and the GR-3 Plus?

Depth. The GR-3 reaches 7 metres and the GR-3 Plus reaches 15. The processor, battery, 600g weight, software and two year warranty are identical, so the £300 difference buys penetration and nothing else.

How much is the GR-3 Plus?

£1,600. The GR-3 is £1,300 and the GR-4 is £1,750. If you are deciding between the Plus and the GR-4, the GR-4 is generally easier to get good results from.

Does it really scan to 15 metres?

For substantial features in cooperative ground, yes. That figure describes voids, structures and large masses, not small objects. Mineralised and waterlogged ground reduces it. This is true of every scanner on the market.

What does the gradiometer actually measure?

Variation in the magnetic field, at plus or minus 2000 microtesla across two sensors. Comparing two sensors is what lets it separate a genuine buried anomaly from general background, and what lets it tell iron from gold and silver.

Do I need a phone to use it?

You need an Android or iOS device to see the 3D analysis, which is the point of the instrument. It connects over Bluetooth 4.2, so any reasonably recent phone or tablet works.

How long does the battery last?

About eight hours, from a 3.7V lithium ion pack with Type-C 25W fast charging. That covers a full survey day, and it recharges from an ordinary phone charger.

Will it work in British soil?

Yes. Mineralised clay reduces depth, as it does for everything, but gradiometer scanning copes with British ground well because it is reading structure rather than fighting conductivity.

Is it heavy to carry round a site?

600g, which is lighter than most detectors. Over a long survey that matters more than the specification sheet suggests.

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