---- Size 40*50mm ------ Magnetic fields have been studied for as long as we have known about these mysterious devices. The hardest part is just imagining how the fields affect the outside world,because we just can't see them! ★ View magnetic fields for personal or scientific research. ★ Just place the card on the surface of the magnetic material, and it will reveal a magnetic field of pattern. ★ Resuable. When moved to a new magnet, it will organise a new pattern of magnetic field immediately.
Trustpilot
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