GR-4 Dual
The Conrad GR-4 Dual Series Breaks New Ground
Are you looking for a professional device capable of detecting underground structures, minerals, and hidden treasures with unparalleled accuracy? The Conrad GR-4 Dual Series opens new horizons in exploration, combining the latest 3D ground scanning technology with a modular design for maximum field performance. Ideal for professional treasure hunters, archaeologists, and enthusiasts, the GR-4 Dual System enables immediate detection, analysis, and location of underground anomalies.
The new generation GR-4 is an advanced ground scanning and detection system that allows you to detect underground anomalies, perform 3D analysis, and evaluate the results instantly.
Conrad GR-4 Dual – Multiple Technologies for Maximum Performance
6 Different Scanning Features
3D Ground Scan System, Detector Quick Scan System, Pinpoint Function, Direct Scan Function, Detector Advanced Scan Mode, and Detector Mode for 3D Ground Scanning as Standard Scanning.
Simple Design, Powerful Performance
The GR-4 is designed to be extremely simple and compact, making it accessible to everyone. The 3D Ground Scan System enables the detection, measurement, and location of buried metal, magnetic objects, graves, chambers, and cavities, such as tunnels, underground. The specially designed Groundtech Portal – 3D Analysis software graphically displays magnetic (iron or steel) and non-magnetic (gold, silver, or copper) metals. Depending on the target size (diameter) and soil structure, depths of up to 15 meters* are accessible.
The Newest Generation of 3D Ground Scanning Devices
The GR-4 Dual is an advanced ground scanning detector that enables you to detect underground anomalies and perform 3D analysis. Designed to be a practical and versatile metal detector and 3D ground scanner, the GR-4 Dual provides a comprehensive and multi-functional solution for professional treasure hunters, archaeological treasure hunters, and underground structure detectors. The device is equipped with six different scanning modes.
Multi-Language Support
The GR-4 Dual is easy to use and is available in language options such as English, German, Spanish, Italian, French, Turkish, Russian, Chinese, Arabic, and Persian. Our mobile app also supports 25 languages, ensuring a seamless experience for users around the world.
Groundtech’s Optimized MFS-2 Dual Sensor Technology
Achieve successful scanning results thanks to advanced sensor technology and a faster processor. The highly sensitive MFS-2 Dual Sensor Technology allows for more sensitive and deeper scanning. This advanced technology, which reduces the margin of error, ensures optimal scanning results. With a faster processor, the GR-4 Dual offers an enhanced and accurate scanning experience.
3D Graphics
Get results quickly thanks to clear graphics. When scanning with the GR-4 Dual, settings and results are displayed to the user on the built-in display. It also provides real-time, detailed 3D analysis through the G-Portal (Groundtech Portal) app, designed specifically for Android and iOS devices.
Groundtech GR-4 Dual Features
The GR-4 Dual model is equipped with an integrated Pulse Induction (PI) detection system, in addition to 3D ground scanning capabilities.
This technology delivers superior performance, especially in areas where traditional detectors struggle, such as highly mineralized soils, saline soils, and coastal areas. The PI system can detect targets deep underground without being affected by mineral density or soil composition. This allows for the detection of large mineral blocks, buried precious metals, or deep cavities with clearer and more stable signals.
Thanks to its modular design, the GR-4 Dual allows for easy conversion by mounting a PI search coil on the magnetic sensor mounting plate. This enables 3D ground scanning and professional PI searches using a single device. This feature provides users with two powerful technologies simultaneously, without the need to carry two separate devices. As a result, the GR-4 Dual provides a complete, standalone solution for multi-purpose fieldwork, deep searches, and challenging terrain conditions.
GR-4 Series Comparison
| GR-4 | GR-4 DUAL | |
|---|---|---|
| System | 3D Ground Scanner | 3D Ground Scanner and Pulse Induction Metal Detector |
| Sensor Technology | MFS-2 Dual Sensor Technology (Gradiometer) ±2000 microtesla | MFS-2 Dual Sensor Technology (Gradiometer) ±2000 microtesla |
| Detector Technology | – | Pulse Induction Technology – 1 kHz |
| CPU | 240 MHz CPU – 12-bit A/D Converter | 240 MHz CPU – 12-bit A/D Converter |
| Depth | Up to 15 meters with 3D scanning system | Up to a depth of 15 meters with the 3D scanning system Detection system up to a depth of 3 meters*** |
| Scan Modes | 3D Ground Scan, Live Scan, Locator | 3D Ground Scan, Live Scan, Locator, Quick Detector Scan, Advanced Detector Scan |
| 3D Analysis App | G-Portal 3D/4D Analysis Software for Android and iOS | G-Portal 3D/4D Analysis Software for Android and iOS 3D/4D Analysis Software for iOS |
| Language | Device supports 11 languages, mobile app supports 25 languages | The device supports 11 languages, and the mobile app supports 25 languages. |
| Battery | Rechargeable 3.7V Lithium-Ion Battery | Rechargeable 3.7V Lithium-Ion Battery |
| Running Time | The 3D scanning system takes about 10 hours. | The pulse induction detector system takes about 6 hours, and the 3D scanning system takes about 10 hours. |
| Wireless Connection | Bluetooth 4.2 BLE | Bluetooth 4.2 BLE |
| Operating temperature | 0°C – 70°C | 0°C – 70°C |
| Storage conditions | -20°C – 60°C | -20°C – 60°C |
| Warranty | 2 years | 2 years |
| Charging Input Voltage | 25W Type-C Charger Adapter | 25W Type-C Charger Adapter Watt |
| Weight | ||
| Dimensions |




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