SCM model 3
The SCM model 3 was a type of superconductor magnet used by Starfleet Engineering in deuterium control conduits on  starships in 2365. The component had physical dimensions approximately 20 cm by 15 cm by 5 cm.

They were powerful enough to create a magnetic field capable of attracting iron particles inside blood cells.  At close range, the field generated could apply enough force to remove the iron from the body. ()
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