A probe is simply a tool used in piercing the ground to strike he buried object your machine told you was in the area. Makes target removal much easier when you know exactly where it is.
A coin popper is yet another tool, a simple screw driver perhaps, used in levering a coin out of the ground without actually digging a plug.
Slice the ground above the coin and slip your coin popper underneath the coin. Then simply push the coin popper handle down and the other end goes up with the coin (hopefully,) going along for a ride to the surface.
