I want to measure h not bltbrgtthe magnets in question are, Ask an Expert

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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

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