Heres the spec and field test report for the 320, its been around for 2 years suprised i dont know anyone whos got one.
If you can use the 120 should be ok with this one they operate the same.
They state two detectors in one, the way im reading it says analizing both iron and good metals at the same time to add better discrimination, but all the IB machines ive delt with do that anyway, when you sweep the ground all is picked up via the coil and circuitry its just when discrimination is applied it just lets you hear finds that you want.
It runs really low at 4.5khz so thats interesting, because most of the manufactures are runing higher or multi or two 5/17khz
Ill post this on geotch and see what feedback I get cause maybe im missing something
Regards
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satdaveuk
