That's a really good question. Manual settings on detector for discrimination can increase the depth at which things are detected, but if you get the settings wrong, you probably won't find much, so it's a risk. I think that for less experienced users, automatic detector settings are the best solution a it reduces the likelihood of making mistakes.
In most cases, one metal detector will do it all except for specialized situations. So nugget detectors and underwater ones wont be good for more geneal detecting.
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