CMS Magnetics® 4" x 6" Green Magnetic Field Viewing Film, Fun! Reviews

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YES! I gave this as a gift to my (23 year old) boyfriend and it was his favorite gift. He brought it in to work and was the star of the show (this is MIT we're talking about).

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Being able to see the magnetic fields is awesome. Due to the fact that the film has memory, pictures can be drawn and erased sort of like an echisketch. It is like taking a picture of a magnetic field. The only problem I have is that it scratches very easily and two magnets coming together from either side does serve damage. P.S. if you want the best experience use neodymium rare earth magnets of grade N42 or higher.

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These sheets remind me of the iron filings we used in elementary school to look at magnetic fields. It's not super-sensitive, but waving it around inside a piece of equipment will quickly show if there are any strong magnetic fields. For any geek or physics/science kids, this is a very cool and educational toy. For those of us who work with linear motors, it's a tool.

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I bought the following related items together, so I'm putting the reviews together as well for your convenience.

A)

> 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)

> 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)

> 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)

> 4 stars

> Pro a) reasonably priced; & b) works surprisingly well showing the flux field.

> Con a) not as good as ($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).

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I was and am using this to see where the pole pieces and bars are in a sealed pickup to make sure it would fit a certain string spacing. Thank you