Types of MDs- VLF vs PI

Stang1968

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Jan 8, 2008
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Orange County, CA
What do those acronyms mean? What are the differences between how they operate? I have to admit, I don't even know what type my Ace is, but I see these terms often and never fully understand them.
 
Stang, there is a great place to learn all bout this topic. I figured instead of explaining it the way I would, this would be a better option :)

HOW METAL DETECTORS WORK

It's a 6 or 7 page long article, with pages dedicated to explaining VLF, and PI.
 
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