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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