The author distinguishes the suction force of a strong magnet of NdFeB and usually distinguishes it with the instrument and can share it with everyone:
1. Usually, a magnet of the same specification is placed on a plane that can be adsorbed, such as a patch, a blade, an iron gate, etc., and the size of the magnetic force is discriminated by hand.
2. Use electronic scales: magnets with weak magnetic properties generally have problems with their density. If the density is small, the magnetic force is relatively small. If the weight is heavy, the magnetic force is relatively large. On the contrary, the light weight is small. If the magnet is required to be relatively high, the instrument is required. The test, the above statement is all experience, only for reference!
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