It is understood that the GOLD BUG PRO DP (Gold Expert Enhanced Edition), the top gold detector imported by Fisher Company in the United States, has artificially enhanced the signal sent by gold by several times in design, so that it can better suppress the signals sent by other metals and make it easier to detect gold. This technology has been patented in the United States, which is beyond the reach of any other gold detector. Some domestic high imitations don't have this ability, and the appearance and indicators are exactly the same, so be sure to keep your eyes open when buying, but don't buy fakes!