Maybe it would be a good idea for several people to place a clad quarter in the floor and swing the coil over it for a numerical reading to report on the forum. Add the numbers and divide by the number of reports for an average unless someone is way out of normal range. This test should show quickly if someone was out of normal range. Just make sure that everyone is using the XL pro for the test and not any of the other pro series. My Pro XL isn't here right now or I would be the first to post.