Deep? airtest vs. in the dirt

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    • at #2239

      I saw this post over at NASA Tom's,54908And it made me start wondering...have any of you guys ever MEASURED a detector that will truly go deeper in the dirt than it will airtest on the same target?

    • The nearest I've ever come to air testing is when I throw a coin on the ground or in my case the sand and check to make sure it's working.Otherwise never done any air testing.I don't feel it's necessary especially knowing that it tells you nothingabout how it reacts in the real ground conditions.Getting extra depth only comes with experience of one's own detector.But of course that is only my own opinion.

    • at #2810

      Interesting thoughts there. I air test mostly to check meter readings but in doing also notice distance from coil to check sensitivity,  Sensitivity used depends on what type of area I am hunting so I get a general idea how deep I am looking.  I do think there is a certain kind of conductivity involved when a coin has been buried for a time "HALO" some call it. This shows when you disturb the dirt and the signal seems to disappear.Thin dimes seem to be good at this 😀

    • air testing works good to show detectors and to see how they are working – not accurate. as some machine air test better than others. But if you are going to true ground test I think you need to leave coin in the soil with moisture so it gets a halo. Some of them I have been watching they dig a trench and stick them in the side, but they are in plastic and on stick so soil is doing nothing might as well just air test. Sorry I didn't get to watch the video you had on there mark

    • at #2812

      Like you guys, I do airtesting for comparison purposes and to check ID's on targets (especially trash items).  The halo situation is very intersting.  Some smart folks think it's actually electrical contact with the soil around the item.  One thing is for sure, it would HAVE to be a a metal that can oxidize and join with the soil.  Gold, for example, shouldn't be able to get a halo because, as far as I know, it doesn't oxidize in the soil.  Silver and iron, though, do.  So far, I've never seen a detector ground test deeper than it will airtest on the same item.  I'm definitely open to debate and proof though!

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