12x12 Green Magnetic Flux Viewing Film for Revealing Hidden Magnetic Field Patterns in Permanent Magnets for Science Projects, Research and STEM Education in Magnetism

This magnetic viewing film is awesome for visualizing magnetic fields clear, responsive, and perfect for science demos or teaching. Great size and fun for kids and adults alike. A cool addition to any STEM kit.

Good product, quick delivery. Great value.

Worked well to show the magnetic fields for science project.

These are great. A certain type of person will want to carry a piece of this material once they see it. With this card you carry it easily in your wallet. I will get some more to share with other friends of that type.

Not useful for daily things, but great for science experiments and entertainment. Probably the most useful thing about it is that it is basically 'x-ray vision' for the eddy current experiment where you drop a high-power cylinder magnet down an aluminum or copper tube and it drops very slowly. With this, you can 'see' the magnet through the tube as it falls. It's also fun to investigate refrigerator magnets and multi-magnet cubes, etc. With this little sheet, I accidentally discovered that putting my rare-earth block magnet on my fridge magnet made an obvious area where the NdFeB permanently overrode the poor little fridge magnet's field forever! :O It didn't stand a chance. "What can ferrite do against such reckless Teslas?" --fridge magnet, 2019-2019 Update: 2022 and mine still works great, although I haven't used it much. Surprised to see people saying they only work once. Maybe if you pinch the surface between two magnets, or scratch the back, you'll pop the little fluid areas and ruin them? Any way I've kept mine in its paperboard envelope and it seems safe in there.

help with finding faulty ABS encoder.

I bought the following related items together, so I'm putting the reviews together as well for your convenience. A) < Magnetic Field Demonstrator, Student, Value Pack > > 1 star > Pro - cheap. > Con - filings too big & heavy to align with or indicate the flux lines, so you just get "indicators" that clumps together without revealing much insights. B) < CMS Magnetics® 4" x 6" Green Magnetic Field Viewing Film, Fun! > > 3 stars > Pro - a) it really does look very cool, & weird, & psychedelic; & b) shows magnetic strength. > Con - a) but it gives you little bang for the bucks (when including shipping); b) it doesn't show flux lines; c) thin so may be damaged if not careful. C) < American Educational Steric Demonstrator, For Magnetic Line of Force > > 2 stars > Pro - it sort of works, showing the magnetic flux lines. > Con - a) but it's overpriced for its quality; b) flimsily made with thin brittle plastic pieces glued together as if toddlers; c) pointers don't rotate well and are spaced too far, giving very low resolution; d) awkward to handle, & not designed well. D) < Dowling Magnets Mysterious Magnet Tube > > 4 stars > Pro - a) reasonably priced; & b) works surprisingly well showing the flux field. > Con - a) not as good as < 3B Scientific Three Dimensional Magnetic Field Lines Device, 140mm x 140mm x 120mm Size, 21mm Hole Diameter > ($174 as of 10/18/13), but doesn't cost as much either; b) without fluid to help counter gravity (like the expensive one above), flux lines droop. >>Conclusions: 1) For neat magnetic visual effects, get (B) of above; though methought overpriced, but still affordable. 2) For demonstrating magnetic flux lines, get (D) of above for its good value & say ~80% demonstrative effectiveness; unless you can afford the high quality alternative mentioned above. 3) Forget (A) & (C).

Worked perfectly for detecting the magnetic fields in my new vehicle hub assembly! Also, fun to use on magnets and stuff. It's a very thin piece of material without and borders, but it works!

Pratique et ludique pour montrer les champs magnétiques.

No sirve

思ったより面白くなかった。

Es justo lo que esperaba, al principio la lámina es verde, al pasarle un iman se oscurece pero no por eso dejan de verse los campos magneticos. Te ahorras las limaduras de hierro en los experimentos.

while being bigger than most of the other on the market is is really weak. You will need a really string light to even see the patterns. and I paid €60 for this... :(