That's an MFD --Molecular Frequency Discriminator. The first photo is the receiver. You attach that to you belt directly in front of you. The black rocker switch is for big filter, like 10 kg. The twist control is for smaller filtering. Do you know how to use L-rods? That's the hard part. Most people never learn because they cannot become detached from the search. I tell people to pick an object out in front of you a ways and look at it while you are searching. This helps to take your mind away from the search.
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