I have been given the above VLF detector and am attempting to figure out its operation. And YES I do have the manual and have read it repeatedly. But when the unit is set to "Full Discrimination" (knob is fully clockwise), the tone I receive from a rusty nail is identical to a silver dollar - no discrimination is occurring. I am expecting no tone from the ferrous item. Am I doing it wrong? What else might I need to do to fully discriminate junk. Other than that it works great! Thank You
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