We treasure hunt all summer long on the 1715 wreaks off Florida's Sebastin coast. Is it worth it? Well we are a lot poorer for trying, but when I look at a few of the items we've found and knowing that no one has looked at or touched it for 300 years, yeah, its worth it.
As for coins (non-rare modern), rings, etc. we find some and again, its not going to add up to the cost of the machine.
I find diving empty handed (ie: no metal detector) to be somewhat boring. But with a metal detector each swing of the coil could bring something of great interest! A small token from a long lost person, an anchor, a spent bullet, whatever, each has a history and that blip in your earphone brings excitement! Fishing lures, lunch buckets, lawn chairs, boat parts, all have a story.
Since you are most likely diving in fresh water the things you will find will most likely be in better shape. Old bottles, are also neat to find. How will a metal detector find old bottles? Well, some had lead foil around the neck, some will be found near metal caps, or other objects tossed in by the same person. If you're interested check out
www.kellyco.com
they offer a wide selection of machines. :fish: