4 x 4 Inch Magnetic Field Viewing Film

Works great but I would recommend taking it out of the cardboard thing it comes in

I have been using the green field viewer sheets for years, and they are great, but I was looking for something that made a clearer image. So I got some of these. And they are amazing! I thought they'd be good, given the reviews, but I assumed that the photos were faked. They aren't—you really do get different colors and a very striking pattern when you have an interesting magnetic field to make visible. The only downside is this: This film only works on really strong fields. Refrigerator magnets.... Nope. You need strong rare earth magnets to see a good effect. But if you have strong magnets and you need to make a striking visualization of their field.... This is a great tool for the job!

Have you seen what different magnet fields look like? This is a great buy to help visualize what is happening.

I got this to use in a classroom. It's not very sturdy so probably won't last long. It's really neat to see the patterns from the magnets. I haven't found a magnet to make the patterns in the photos yet.

Not as flexible as I had hoped but it works great for seeing cracks in tone wheels on camshaft or crankshaft tone wheels

Works fine. No issues.

This magnetic field viewing film performed exactly as I needed—clearly showing the magnetic field pattern of a camshaft sensor’s target magnet so I could confirm it was functioning properly without wasting money on unnecessary parts. The detail it reveals made diagnosis quick and confident. Beyond that single repair, it’s become a fascinating tool for exploring magnets in everyday items and seeing how their fields are arranged. The film is reusable, easy to handle, and has already provided more value than I expected—both for practical troubleshooting and satisfying my curiosity.

Great concept but does not react to low intensity magnetic fields.