4 x 4 Inch Magnetic Field Viewing Film, Magnetic Field Viewer, Magnetic Flux Display, Magnet Pattern Detector, See Magnetic Field for Scientific Project (4 * 4 Inch) 4 * 4 Inch auspowers_batchfour The tones will be more

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4 x 4 Inch Magnetic Field Viewing Film, Magnetic Field Viewer, Magnetic Flux Display, Magnet Pattern Detector, See Magnetic Field for Scientific Project (4 * 4 Inch) 4 * 4 Inch auspowers_batchfour The tones will be more4 x 4 Inch Magnetic Field Viewing Film, Magnetic Field Viewer, Magnetic Flux Display, Magnet Pattern Detector, See Magnetic Field for Scientific Project (4 * 4 Inch) Product Name: Magnetic Paper Magnetic Field Viewing Film Magnetic Field Viewer Magnetic Field Demonstrator Color: Brownish Yellow Material: magnetic nanoparticles Features: Clearly observe the patterns of the magnetic field. Place the film as close as possible to the magnet item to