I was just in New Jersey detecting on Long Beach Island (Beach Haven) with my cz3d. Never used it on a Jersey beach. Tried to GB but the threshold was the same no matter what number, so I set it on 5. It ran smooth and quiet in disc, 0 disc, 5 sens, salt mode, volume 5, 10.5" coil.
In the wet salt sand I was pulling clad deeper than 12", needless to say, I was impressed.
That unit with the 8", coil air tests a clad dime at 12-1/4"
The slope is kind of steep, so the water doesn't cave in the sand as it would on a lesser grade. I didn't chance getting in the water, just went at low tide. I believe the beach was replenished recently.
Only noticed a few smears of black sand, not much. A couple hrs turned up $6.55 and one silver 925 loop earring. After detecting I did some surf fishing for kingfish, man are they tasty.