When the meter says that an object is 6" deep, and your coil is already 1" above the ground, does it mean that it is 6" from the bottom of the coil (5" in the ground)? If you rest the coil directly on the ground would it still be 6" deep. It seems that when I try to measure the distance from the coil while "air testing", it's always further from the coil than what the display says. So I wonder, does the electronics have an easier time telling depth in the air as opposed to in the dirt. I realize that soil conditions can effect a depth reading. In the past I have always accounted for the distance of the coil from the ground. Is this the right way of doing things? I know this may be a lame question, but it has always puzzled me. Thanks.