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Does anyone on this forum have experience with the TM808? That is, its real depth capabilities, whether it even detects objects of 7x6cm and at what depth. A man brought me a device and claims that for example a phone with a diameter of 4cm x 6cm "allegedly" detected at about 70cm to 1 meter, watching the videos I could not see anywhere the real capabilities of this detector that even now since it does not detect that miniature phone it almost claims to be broken!?
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anyway, there is two-box or VLF either PI the Eric's Diagram Coil size vs coin size vs Depth will sure working always. because physics rules are same in any case.
for 7x6 cm target is existing optimal coil size for max depth. two-box TM-808 is not optimal. you can not find by it a copper badge of soldier of First World War.
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