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None of the magnets were marked N and S like the bar magnets in school. So we would take 2 magnets and the 2 surfaces that were attracted to each other were N and S. Then to identify the N side we would do a test pass by the sensor holding the magnet by hand to see if it triggered. If it did then you knew it was N. I usually marked the surfaces red and black with a Sharpie at the time of checking which were attracted, not knowing what as N or S.