Max
Also I built exactly as magazine, and maybe doesn't work for treasure hunting. Mi intention never was for to find water. So, I make many modifications and added audio stage and other circuit.
Yes, electric fields of treasure is very strong, no of treasure inside iron box.
You can must able in build this (nothing to see with stethic!) and walk in inland for to take conclussions.
ALL BS. The article doesn't say anything of mods required to find water flows! 
Mr. "INTELLIGENT":
Of course, article no refers modification!!! These are mine!!! What "intelligent" you are for not to see this. Or best, you're a big LIAR.
Light from treasure ! 
And maybe a big X that say you where to dig the hole !
Ahhh!!! You can see the halo, only you!!!
If you're the cure,
Medice, cure te ipsum.