How to measure magnetic field intensity?

I want to measure H, not B The magnets in question are permanent magnets (large Neo or SmCo magnets), not... show more I want to measure H, not B
The magnets in question are permanent magnets (large Neo or SmCo magnets), not coils


=====================....Steel
____........................____
|..N..|........................|..S..|
|..S..|........................|..N..|
-------------------------------|
|...............very.................|
|......high permeability......|
|............material..............|
--------------------------------

^^^^^ Magnetic circuit ^^^^^


How can I determine the magnetic field intensity or the mmf of the magnets?
The measurement needs to be something I can actually do, not some giant set of Helmholz coils in outer space
Update: David - A Tesla is a unit of magnetic flux density, not magnetic field intensity. The only place where B=mu*H is valid is in air, so knowing B doesn't help me
Update 2: Sorry. I should have said, "B = mu*H is only helpful in air, where I know the permeability."
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