I have used a CZ since 1994. I currently use a CZ70 PRO. Each hunt is different. I took my detector with me to Holland this past summer and hunted tulip fields as well as salt water beaches. I hunt Civil War site here in Oklahoma as well as old house sites and even hit a park or two when I am really bored. From what I have been told and from 14 years of using a CZ, in discriminate mode, your signal into the ground would look like an upside down cone. Or in other words, the signal comes to a point underground. Using that analogy you can see how you really have to heavily overlap your swings to get the best coverage. In all metal mode, the signal is more straight down or bucket shaped. This is why you get more coverage and depth in all metal mode. This being said, what are you wanting to detect? On Civil War sites, you want to detect everything. Looking for house sites, you want to detect everything. On the beach you want to detect everything. On a play ground you want to discriminate. Or at least that is what I want. You can by the push of a button change from all metal mode to discriminate to let the detector tell you what it thinks the target is. I personally like to listen to the ground chatter. I know in an instant if there is a change from some kind of metal. If you hunt grassy areas in discriminate mode you will be getting a lot of "falsing" unless you really have the sensitivity turned way down. Then you will miss deep targets or smaller targets. Again, that may be your intentions. You can really tell when the ground mineralization changes in all metal mode. The chatter that I mentioned will change. A few things that I know for sure is that pull tabs and small rings sound alike. Square tabs and Minnie balls sound alike. Shotgun shells and Civil War buttons sound alike. Bobby pins and small chains sound alike. And beer bottle caps sound just like some denominations of Euros. And 1590 Holland coins sound very cool. I also know that weather condition, soil conditions, and ground condition and depth will change all of the above to some degree. I always dig at least the first 10 targets that I hear at any site just to learn what Iron sounds like on this site or what pull tab sound like on this site or beer bottle caps, I know you were wanting a quick answer and maybe you got it. But you have to know what you are listening to before you discriminate it out in my humble opinion. I have dug some mighty nice things on Civil War site because I run all metal mode. I have a few nice rings from beaches because I decided not to believe it was pull tab. Beaches are no brainers, you dig it all. It is to easy digging. Hard pan is different. If you have heard iron and dug iron several times, then it is up to you to dig or pass. I again will dig my first 10 or so targets just to get a feel for the conditions. Once you have run a couple hundred sets of batteries through your detector you instinctively know your setting without thinking about it. Again, I vote all metal mode depending on conditions and switch to discriminate mode to verify target then decide to dig or not. Just my 2 cents. (ok, may a buck and a half worth) Good luck with the CZ. It is a great machine.
Joe
