https://www.youtube.com/watch?v=Wvy_sCJT8Yk I guess this is more of a preview as I have not had the machine long enough to review its durability. There are several coin sorting machines that measure the density of the penny to determine whether or not such a penny is copper. The RYEDALE is slightly different. it basically acts s a metal detector or an alloy sorter. You put a sample coin inside this unit that stays there… Read more