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Be careful not to let those snap together and break themselves, or your finger.
I bet you can get much higher flux densities by closing the magnetic circuit with steel, except for a small gap. Here are some ways to do that without cutting metal, if you can find a couple of steel plates flat on one side. The lower views also depend on finding (or stacking) steel shapes a little bit thinner or thicker than the magnets.
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Magnetic field measurements on disc magnets
