I have the E-Trac great machine .... I think ? I have tried the air test and it seems that the depth in the air test is not what I was expecting. Now I have had the machine out of the box for 45 minutes. Scanned the directions, went to the sensitivity section turned to manual, raised to max what am I missing. I just want to get the max depth because I am going out in the morning and I can't learn this with trial and error. I have had an Explorer XS for years (non Better) I ran max 32 at all times. I know the issues with the falsing signals and I have no problems with them .. I want to get to the max depth ASAP and I will figure the rest out as I wait for anyones advice on how to max out on the sensitivity on the E-trac.. I don't mined false signals I can handle them .. All my hunting finds at this locations are 8 inches and deeper. All coins are dated before 1830 with over 50 coins found so far including many very valuable coins including many coins in the 1700's. This is the reason I can use a quick lesson on depth .. Thanks Jim