I was quite surprised when I did some bench testing 3 of my detectors against the AT pro. What I do to bench test is take a card board box and mark 8-12 inches and cut a slit in the box so a coin or ring will fit in the slot. Go to the park and my coil can slide on top of the box so all things are equal. I have a fisher cz3d,(14 months old), ATPro (7months old) fisher cz-21 for beach hunting (12months old) and a whites duel field PI. I know with the two beach detectors I should test them in a beach setting but living in Utah, no beach to test.
I use a 1901 dime, 1898 quarter,1897 fifty cent, 1878 dollar and a women's and men's gold ring.
The fisher cz-3d, fisher cz-21 and whites dual field all detected the coins mentioned above deeper than the AT Pro buy one or two inches,but the real surprise was the AT Pro detected the rings deeper than all of the other detectors with the exception of the whited PI detector. For example the AT Pro detected the dime at 8", the quarter at 9"' the fifty cent at 10" and the one dollar at 10" which surprised me, thinking I would get more depth with the dollar. Surprising right? The women's ring I detected it at 11". This is a women's ring. My cz-3d detected it at 8" and at 9" the signal was so weak and inconsistent I put it in at a 8". That's almost 3 inches more dept using the ATPro verses the the cz-3d. The fisher cz-21 came in a solid 8"
Speaking of detection dept! For coins the fisher detectors were better, but for rings the AT Pro was better which surprised me. I did also notice that I had to swing the detector fast which my other Garrett that I don't use any more you had to crawl, and of course in the all metal mode with the cz-3d I had treshold changes at 12 -14 inches which I don't usual hunt in all metal, it's mental mind buster, like the whites dual pro is but the all metal dept is rock sold. Also as a side note I tried my larger cz coil which I think is a 10" where my standard could is a 8 inch and I did not get any more depth. In fact I thought it was worse, but the standard 10" coil on the cz-21 worked out great, so there must be some design difference so I prefer the 8" coil.
But even though the ATPro may be a inch or more less in depth, in trashy areas, if you listen to the consistent tone and look at your screen you will dig coins in trash areas that you can't with the cz-3d,, and of course for rings it's deeper up to three inches.
This really surprised me about the AT Pro. It's a great detector and if it could ectch out one or two more inches in silver it would be a killer, but like I said its hot on rings as far as depth. Choose your flavor... Deeper gold rings or deeper silver coins?
Hope this helps.
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