First of all, I have nothing to post. I was hunting an old house site that has been pounded through the years because of its easy access. I was using discrimination of 32 from the bottom and 36 at the top if that is understandable. I saw Khouse's video and tried to simulate. I used multi tone. Some places there was a complete null. You know that there was silver hiding among all the rust. Sometimes the real rusty nails would just about lock with the second number being 45. Nothing brought home except a stainless screw...Thanks for any instruction...Also I've also tried the TTF.