So much falls in the vdi number range of common junk items. Old brass dog tax tags fall in the low ranges, buttons, early coins. It is important to dig those vdi numbers if one is in an area that their is almost no chance for a pull tab to be found. Areas that i dig all these readings in are the side walk tear outs and where they shave off the top layers of soil. Hunting this way i find more seated and barber dimes that mercurys.