I just tried the GT in all metal on a dime , and a nail, --and found it is like the Infinium , for example on the nails as you pass the nails you will get a low sound in the middle of the coil and then a high as the rim of the coil passes over the target . then on the dime you will get a high on the center followed by a low as the rim of the coil passes over by this i can tell Iron from high conductors , i thought that only in disq could you tell the diffrence , any one else notice this ?