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Magnetic Field Viewing Film 4"x4", Magnetic Flux Display, Magnet Pattern Detector, Scientific Project Teaching, Reusable and Automatic Recovery - Brownish Yellow: Amazon.com: Industrial & Scientific
CMS MAGNETICS - Magnetochromic and Monochromic Magnetic Flux Viewing Film for Revealing Hidden Magnetic Field Patterns in Ceramic and Neodymium Magnets, STEM Education Research Projects in Magnetism: Magnetism Science Kits: Amazon.com: Industrial
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