you can use any material any time you want. but the question is, are you guided by the Holy Spirit or some spirit who has a negative energy ?
i found out that when you have a negative energy or you are not guided by the Holy spirit or entity that recognizes Jesus Christ and God the Father as the God of NOah, Moses , and Jacob, all they point is the decoy. if you are guided by the wrong spirit, you are likely to be guided to the decoy?
how do you know if you are led to the decoy?
the decoy are numerous and varied. they usually protect the item in a circle formation. some are 8 feet away, some are 2 feet away. so when there is a real item, there are likely 6-8 decoys around. in short, you can detect using your metal detector 6-8 detections and 6-8 "so-called" items.
how do you know if your dowsing is correct? its simple. use your dowsing skills first. then use your metal detector. if they detect the same, your dowsing is not accurate.
real items are laden with anti-metal detectors. and real items are surrounded by decoys. small real items protect the big items, the entrance of a bunker or other more precious items
before you invest in metal detectors and scanners, better think twice.
if you dont know how to locate real items, use metal detectors . THEN PRAY. AND PRAY. afterwards, try your luck by drilling. drill as many as you can until you that unbreakable cement.