The name derives from the fact that the system combines both a magnet and a metal detector in one unit. The 12,000 Gauss magnet is capable of extracting ferrous particles from 25 microns up and non-ferrous particles from 0.6mm.
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This complete item is approximately 350 words in length, and appeared in the March/April 2003 issue of Bulk Materials International, on page 16. To access this issue download the PDF here.