Take both detectors out with you. Find a nice clean patch of ground with no trash. GB both units, one at a time (they will cross-talk with each other when you get about 30' apart or closer). Throw down a wide selection of targets, like coins, various jewelry (if you have it), pulltabs, pullrings, foil, screws, nails, bottlecaps, screwcaps, etc. Scan all targets with both detectors. Coins should come in on the meter or your CZ-6 in their respective slots, as will the pulltabs and foil. Nails give weird signals, and often give a high-coin chirp along with an iron tone. Broken pulltabs often come in as a nickel (Nickels are actually below tabs and above foil on the order of conductivity). Bottlecaps will bounce Iron/Nickel/Tab. Screwcaps will bounce Zinc/High Coin. Round iron objects, like large washers, give really strange signals. Silver ring, as long as they are intact, will read High Coin. Broken Silver rings often register as pulltabs. Gold rings, depending on shape, size, and karat, can register all over the meter.
There's no meter non a CZ-20, so you just have to go with the sounds.
If you're fairly new to both detectors, I'd suggest learning the unit in an environment that's easy to dig in, like playground sandpits/woodchip pits, or the dry sand at a beach. Once you figure the tones out, and learn what to expect on sensitivity, go ahead and start hunting grassy areas with the CZ-6, and try getting in the water with the 20. Also, you can expect a little increase in depth when hunting wet salt sand, due to the increased conductivity of wet salt sand.
BTW, have you ever water hunted before? Hunting in water, with little or no visibility, takes a lot of practice before you can start recovering targets easily. I've been doing it for four years, and even I can't get the target on the first scoop all the time.
HH from Allen in MI
