The Holy Grail...
...looking for a good, inexpensive salt water beach detector
Aren't we all?!
I for one will digress a bit and NOT jump into the PI camp.
Why? As already said, they have little DISC and will signal iron just as well as anything else. They go deep, true, but aside from digginbig holes in the presence of bikini sirens, I am not enamored of moving heaps of sand - just to find bobby pins and fish hooks.
What I would prefer is decent iron discernment and
acceptable depth. I say "acceptable," because Im too old and fat to be excavating beaches, even if I wanted to.
So what do I mean by discernment? Something that alerts me to the presence of iron, as opposed to masking it with discrimination. Iw uold also expect such an instrument to remain sensitive to other low conductive targts like gold and the usual stuff like coins and pulltabs.
Right now, only the Whites BHID and Minelab Excaliber seem to soundly offer these traits. Tesoro claims its Tiger Shark offers them, too, but I know little about them at the salt shore. The Sandman swears by his, but uses his Excal more, it seems....
Are these units I mention, "good?"
Without a doubt.
Are they "inexpensive?"
Thats relative. At 600-1000$ per copy, only you can answer that.
I'd say no, so you better start saving.
The truth is, anyting designed to work well in the tough environment at the sea shore
and hold up long enough to be useful aint gonna be cheap.