Groundtech GR-4 3D Ground Scanner detachable-earpiece Automatic Ground Balance continuously calibrates

Automatic Ground Balance continuously calibrates to changing soils as you swing

Deeper Coverage on Large Open Ground

With the operating mode Magnetometer

conductive silver

coil up to 20 hours depending on program and frequency selection

Groundtech GR-4 3D Ground Scanner detachable-earpiece Automatic Ground Balance continuously calibratesThe Groundtech GR 4 is a next generation 3D ground scanner for professional treasure hunters, archaeologists, and serious detectorists who want deep exploration without depending on a phone in the field. Using advanced MFS 2 dual gradiometer sensors, the GR 4 reaches scanning depths of up to 49 feet (15 meters), detecting buried metals, magnetic objects, graves, rooms, and cavities such as tunnels. Its built in high resolution color display shows