Buyers should prioritize Detection Depth and Scanning Range. For industrial or professional geological use, a detection depth of at least 10-30 meters is standard, while the horizontal scanning range should ideally reach 500 to 1,500 meters. Ensure the device utilizes Multi-Frequency Signal Processing to distinguish copper from other non-ferrous metals and soil mineralization. Additionally, look for Microprocessor Control and Geophysical Resonance Technology to ensure high accuracy and stability in various terrain types.