Shirl, the only difference between the Prizm2 & 3 is that the 3 has a depth meter on it, something I like to have. I have a buddy who claims he doesnt look at the depth on his machine, I find it would be difficult to find stuff without knowing the approximate depth. A lot of people here love the Ace250 & are probably cringing that I am recomending a Prizm but bottom line, they are very good & capable detectors and much, much lighter weight than the Ace250. I also recomend you get a handheld pinpointer, TinyTec sells decent ones online for around $40, I'll try to find a link & post it here for you. Any Questions at all? This is the place to ask, so many freindly, inteligent people who love to help. (Im freindly but the jury is still out concerning my inteligence! lol)