My newest detector the GTI 2500 arrived today . Question for those of you that have this machine . Does the surface elimination feature really work ? I buried a quarter at 4 1/2 " . The detector picked it up with a strong signal . I then put a pull tab on the surface about 2 1/2 " off target center and a penny about 3 " from the pull tab . I set the elimination feature at 2 1/2 " . At that point I could no longer get any signal on the quarter and just broken one way broken up beeps . Even raising the coil did not help pick up the quarter. Does this feature really work with your 2500 ? Thank you for any replies ..