No, the type of metal uses is inmaterial. You are simply pushing the auto tune adjustment of the Pro Pointer to the tip of it's sound off threshold. So, when it starts to sound off back off the metal object a hair with your thumb. Then touch the ground in the hole with the Pro Pointer as you hold the object in the same place on the side of it with your thumb. If you do get falsing, back off the object a hair more as the soil's make up may be pushing the Pro Pointer over the edge and sounding off. That's why even after doing this if you search around and think you've found the target, move the tip elsewhere in the hole and see if it goes quiet like it should. But if it doesn't, then obviously the Pro Pointer is sounding off to a false, so you need to back the object off a hair more with your thumb. Actually, what I do is if I think I've got the target sounding off I'll move the Pro Pointer away and then back off the metal a hair more, and then return the tip to the spot. If there is no more sound then it was a false hit, but if it's still there then you can be assured it's really the target. This takes a little practice as there is logic involved and a bit of art. If anything, just remember that after you initial back it off in the air to silence the pinpointer, that it may very well sound off to ANY ground when you stick it in the hole due to the minerals pushing it over the fine edge you are trying to establish. For that reason if it sounds off, move it around and see if it sounds off elsewhere too. If it does then back it off a bit more. If it only sounds off in one spot then chances are it's the real target.
