Deep? airtest vs. in the dirt

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.

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