> Hey straitguy,
>
> You're right. Even if a typical meter doesn't pick up an EM field in
> a particular region, that doesn't rule out EM-related causes.
>
> I don't know of any purchasable meter that measures the magnetic
> vector potential (MVP) in an area, but the MVP has been well
> documented to exert very real EM effects in regions where NO magnetic
> field exists.
>
> It's called the Magnetic Aharonov-Bohm effect and experiments by
> Osakabe and others proved it in the 80s. (There is an analogous
> Electric Aharonov-Bohm effect in regions with NO electric field.) In
> the case of the MVP, it's strength and effect tapers off much more
> slowly than magnetic fields. So even if a magnetic field isn't near
> you, its corresponding MVP could affect the electromagnetic situation
> around you.
>
> -Beau