You guys are ALL wrong. Haven't you seen the pictures of persons posed next to the jars of coins they found ? Pictures don't lie afterall. They wouldn't be allowed to advertise it in reputable magazines, if it weren't true. All you do is wave it at enough likely looking ruins, then pull out your detector to "pinpoint", and I bet you find metal ! Maybe even a goodie!
And as for the scientific truth of the innard components, well: they have a battery, wires, various resistors and capacitors, dials, etc... Therefore it must have electronic/scientific basis. The fact that YOU don't understand it, doesn't make it any less so. And if you attempt to dis-prove it as scientifically impossible, well they've got that covered too: It's merely "un-discovered science". Afterall: people used to think heavier-than-air flight was impossible. Or that the earth was flat, etc..... Same thing here: just un-discovered science.
So please recant of your kill-joy negative attitudes. Give it a try. Because you don't know UNLESS you try. You're not qualified to offer a criticism, unless you've personally tried it . And if you don't find a goodie the first day or first week, it still doesn't mean the contraptions don't work. It merely means you didn't try it long enough. And that you need "more practice". If it doesn't find a goodie in the first month, well durned those sun spots anyhow. Keep trying. If after a year it still don't work, well .... then you don't have the "gift". At NO point is it EVER that the machine simply doesn't work. It's all user errors, environmental factors, need-of-more-practice, etc.....