Spoiler alert: there is not any universal ‘greatest metal detector for gold’. (Even though the GPZ 7000 is near for those of you who can find the money for a detector that’s the same selling price as an automobile). The GPX 6000 represents the current pinnacle of consumer-helpful PI technologies, https://linuxline.org/blogs/125296/Accuracy-of-Modern-Metal-and-Gold-Detectors