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Amazon.com: CMS Magnetics - Magnetic Pole Detector, a Handy Polarity Identifier to Determine Magnet's North or South Poles, Great for School Teachers, Science Projects, and Metal Detector : Industrial & Scientific
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North and south `oles of a magnet with and the curved magnetic field shown by using iron filings illuminated in red and blue Stock Photo - Alamy
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Ferrite Bar Magnet with North & South Identified for Science, Education, Experiments, Students, and Teachers - 16mm x 4mm x 50mm Long - Pack of 200: Amazon.com: Industrial & Scientific
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Dowling Magnets - 712 North/South Bar Magnets (3.13 inches Long x 1 inch Wide x .38 inch Thick), Set of 2: Magnetism Science Kits: Amazon.com: Industrial & Scientific
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