Detectable metal types
Iron nails(0-9):possibly iron
5¢(10-19):possibly a nickel coin
Pull-tab(20-29):possibly the pull tab of the aluminum can
Alloy Screws and Nuts(30-39):possibly some screws such as alloy
1¢(40-54):Probably a zinc coin, type of metal of zinc alloy.
10¢(55-64):possibly be a copper coin
25¢ (65-79):Might be 25¢ or a silver coin
50¢(80-89):possibly 50¢ or a silver coin