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which is a beeping noise that starts out at one pace & progressively gets faster and louder in 4 stages

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Magnetic Field Viewing Film 4"x4", Magnetic Flux Display, Magnet Pattern Detector, Scientific Project Teaching, Reusable and Automatic Recovery - Olive D - 4"x4" sold2024 which is a beeping noiseMagnetic Field Viewing Film 4"x4", Magnetic Flux Display, Magnet Pattern Detector, Scientific Project Teaching, Reusable and Automatic Recovery Olive Placing magnet behind magnetic flux viewing film changes color by magnetic level. Color change according to magnetic intensity Color Gauss50 100G Orange 100 150G Yellow150 250G Light Green250 300G Green300 500G Dark Green 600 800G Blue 900 1000G Dark Blue Film thickkness (m): 150~200Heat resistance test: