Jay and Phil,
The scanner is a Roland Picza (probably a PIX-3)
Jay, the scanner is a touch scanner that has a probe that "rings" or vibrates. When it touches an object, the pitch changes and the scanner "knows" that it has hit a surface. Supposidly, it does not marr or scratch a surface (they use to advertise that they could scan a strawberry without damaging the skin). Still, if you had a _really_ valuable coin, you probably would not want to use a Picza.
By the way, I think the Pix-3 and Pix-4 have been discontinued. Otherwise, they are really pretty cool, but they are sssslllloooowwww....