Idea is to find how deep each detector will get a low conductive coin 5 Pence's , Cut quarter's and Hammered Elizabeth Threepence are used in this test , all the Cut quarter's have the same conductivity level
Coins are flat or on edge
Idea is to find how deep each detector will get a low conductive coin 5 Pence's , Cut quarter's and Hammered Elizabeth Threepence are used in this test , all the Cut quarter's have the same conductivity level
Coins are flat or on edge