Southwind said:
I've done a lot of testing on different gold chains since I hunt tot lots a lot. Best buy far was the AT Pro. I'm a bit surprised with the Compadre answers. I've owned 3,two with the 5" and 1 8" coils, and none of them could hit small gold more than 4-5" deep. Most tot lots I hunt have at least 6" of fill.
Why surprised?
As great as the C is in tot lots, especially for getting close to big metal, I never expect it to go super deep.
I have other detectors for that if needed in tot lots or the dirt.
On the other hand I have found 31 gold rings, 1 medallion and 2 gold chains in 5 years hunting time and only 1 in a tot lot...all the rest of them in dirt.
Not one of them was deeper than 5", most of them were less more like the 1-3" area including 5 heavy large men's class rings.
Using these experiences I believe in my case at my sites the Compadre is still a good choice especially since it seems to hit on all kinds of chains...hard.
Not only the clasps but it can pick up some pretty thin chains even without a clasp with pretty solid and repeatable signals.
My experience only, of course.
As far as the OP about chains and coming in at iron this is exactly right if they are thin or have small clasps.
Due to eddy currents the links in chains can easily cause a diffused signal to come back to our detectors and they will be lower than where you think they would come in.
This includes silver chains and broken rings, too.
I have found many silver chains from very small and thin up to thick and not one came in in the usual silver ring area but from foil on up to zinc only except one.
That was one of my smallest and came in at iron also.
Pic below of that one.
To find chains of any kind you need to understand them and how they behave and they aren't normal.
Know and believe this and you have a good shot at finding them.
Digging some iron and foil signals also helps.