Magnetic View Film Green 12x12"

Packaged well - glossy clear view of magnetic fields - wrap a small piece around a copper tube and drop a magnet or still ball bearing through it to show eddy currents in a conductor. Show polarity of magnets - show how poles are aligned - excellent product

This material is very helpful. I am a hobbyist and I’m trying to figure out how to arrange magnets to make a Halbach array, but was only guessing as to how they affect each other. With this viewing film, I can see how the magnetic fields are shaped as they attract or repel each other which made it much easier to construct the array. It doesn’t detect fields as strongly as I thought. The pictures that are on the site are a little misleading but I guess they want to show off what the pattern would like if it’s well lit.