Metal Detectors

Metal detectors cannot distinguish between man-made iron metal and the iron-nickel metal of an iron meteorite

If I am wrong on this one I would appreciate be corrected by someone who knows more about metal detectors than I do. Metal detectors may be able to distinguish between U.S. nickel and penny coins, but they cannot tell if iron metal contains enough nickel metal to be a meteorite. Iron meteorites are alloys of of iron and nickel that containing 5-30% nickel.