These are the signals you will get on your f2 and what they probably are.
0-15 Is iron Iron
25-28 Pull-Tab ( Or gold! )
28-32 Nickel (Or gold)
36-42 Pull-Tab (old type) (Or Gold)
58-62 Zinc, Penny ( Larger gold so dig those zinconlns!)
68-72 Dime & Wheat Cent Or silver jewelry
78-83 Quarter/silver jewelry /can slaw
86-90 Half Dollar/ Can slaw
91-95 Silver Dollar/ Can slaw
DIG EVERYTHING!