I see this over and over on the forums. People requesting that this machine and that machine be air tested on a dime to see which gets better depth. All it really does is tell you how well the detector can find things in the air, but I do not use a detector for that myself. I do a lot of air tests, but I am only looking at depth from a relative perspective and not as how two different models compare for depth in the ground. In other words, if I have two Gold Bug detectors and set up identicall