You can dowse for anything. Just keep thinking about the target. You can also use just about anything... I've used wire coat hangers and wooden sticks.

A fun thing to do is use some silver as a target. It can be a ring or an old coin. Drop it out in your yard and use your dowsing tools to "find " it. It's a great way to make believers out of folks who don't think it works. When those rods move in their hands, they are shocked.