the area I am hitting with the CZ20 now has large areas where a 100 years of old docks were. There are areas that are about 300sq ft of constant low tone, like your standing on a steel bridge. Tone ain't gonna help, so I am left with a dilema, I am looking for deep old silver coins, according to this previous post the best machine for that I have is the CZ20 http://www.findmall.com/read.php?35,191678,191678#msg-191678.
The best iron machine I have is the Excel, with good silver depth, next best iron machine is S-Ray II, sooo.... And they drop the lake level in two weeks, that's all the time I have left to access it with my boat. What I need is a waterproof Excel!! I find the readout on the Excel actually helps much more than the tones on the Excel, I wish they would have stayed with 3 tones instead of split tones, because when you get over a chattery target that jumps segments, well, was that hi-lo, lo-hi, hi-lo or lo-hi, hi-lo, lo-hi, blast it! What was that? I find it more distracting than helpful. So now I mainly say OK, beeped, look at display.
Yesterday I devised an LED layout for a waterproof Excel to display the LCD numbers. I won't post it here because I wish to maintain my copyright on the design.
BarnacleBill