This listing includes one piece of 12 x 12" magnetic view film which can show you how the magnet are magnetized and the magnetic density distributions.
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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.