Today I went to my favorite detecting place. This spot is 70 acre hilly park overlooking Lake Erie. The ground is bad. The Fe meter on the F75 would black out and in a couple of cases I absolutely could not ground balance Tejon. The only detectors that I ever used that were stable were Explorers and Fisher CZ's. To make it rougher, there are many underground wires, along with overhead wires. I ground balanced at 92-93 and headed for where an old hotel sat during the early 1900's. I have found my oldest coins in this particular spot, but the hotel either burned down or was torn down on the spot. You can't go six inches without running into a nail or two. A good portion of the ground is cinders so that is why I tend to believe it burned down. Nothing great, but one wheat penny came from the same hole with not one or two nails, but three of them. I got a good signal mixed in with the iron grunts in iron audio. It was a 1920 wheat and was about 7 inches deep. I ended up with two more old wheaties and one toasted Indian head. No detector is perfect and I found a flaw in the AT Pro today. Small pieces of aluminum slaw read exactly like a zinc or indian. This place is loaded with this type of trash and most of it is 6 inches or so deep. I dug tons of it today hoping for an indian. The first couple of places I used the AT at did not have this type of modern trash. The AT and myself have no trouble dealing with pull tabs. They are always in the low 60's. The zincs and indians come in about 66-67. If I get a 62-63 I am digging a tab. It is that accurate! One more thing I found today was shallow non rusted bottle caps.They hit with a high tone in the 80 vdi range. Iron audio does not handle the newer non rusty caps. Deeper rusty caps are identified with an iron grunt in iron audio. One thing I noticed about these newer,shallow caps were the numbers bounced around and they had a high pitched shrill to them. A shallow coin will really lock on with a tight number so maybe the jumping numbers will help people to not dig this type of junk. My testing is done. I have taken the Pro to my three favorite, but different hunting spots. I do realize that the perfect detector has not been built, but this one is pretty darn close. R.L.