DescriptionP lace it on magnetized object surface, and t he magnetic field stays on the film so you can further analyse the field patterns. They are wonderful educational tools to introduce students to the science and charming of magnetism.Features-Color:Yellow -Material:Electromagnet -Size:2.00X2.00X0.10cm/0.79X0.79X0.04in -Simply place the card on the surface of a magnetic material and it will display a patterned magnetic field. -Great for personal or scientific research. It can help us study magnetic fields that we cannot see. -It can be used for quality control, product demonstrations, reverse engineering, certification and educational purposes. -A great educational tool to spark our interest in science. Magnetic display at a glance, easy to operate.-Share with your friends and family who like magnet science or
