fetcher - The GPZ 7000 is designed as a gold prospecting detector and is unequaled for "pure, raw horsepower"... it is THE go to machine for professional gold prospecting. Most often gold prospectors are working spots where any metallic object must be recovered, because only gold is in those areas. Many use the GPZ 7000 to find gold other machines will not hear. However, it does have its limitations.... for instance this is not the machine to use coin shooting. It has plenty of ability to see the coin, but does not discriminate what type of target is under the coil... a nail, pull tab, coin, jewelry, whatever you can think of that is metallic will equally sound good to the operator of a GPZ 7000. If its good discrimination you seek, there are a lot of other options available to you. Terry has one very good suggestion, but there are plenty of others that may be well suited for what you want to do. Give me a call if I can help.... I'm just one state north of you in PA.