I have one made by White. Bought it several years ago so I don't remember what I paid for it but I don't think it was very much. I keep it in the RV all the time. When there's nothing to do while camping, I'll dig it out and will search areas like volleyball courts or sandy beaches. About the only thing I ever find is a few coins and pull tabs from cans even so, it still passes the time and you'll never know when you may strike it rich!! When I'm done using it, I always remove the batteries so there's no chance of permanently damaging the unit because of a leaking battery. Thanks for the post. I may just break it out this afternoon.
I've also used it to help people. My daughter had a artesian well but the cap was underground and she wanted to locate it in case she ever had to replace the pump especially in the winter here in NH. She had no idea of where it was only that it was on one end of the house. She purchased the house used. Within about 2 minutes of scanning, I found it. We dug it up and left the cap exposed just in case. It was down only about 6". Lo and behold, 2 years later, her pump died. Saved allot of useless digging.