This page lists manufacturers of quality Long Range Gold Detector, find out more by clicking gold metal detector, gold detector, underground metal detector with competitive price. You can always contact our buyer service for a recommended list of meters and Instruments manufacturers tailored just for your demand. Description. Bionic X4 Long Range Metal Detector by OKM. Highlights. Classic Long-range gold detector with two different detection methods and visual locating software to locate hidden gold treasures at long distances. Depth Customers found treasures up to 20 meters deep in a range of 10 km - check our references.