[XBob]

145 - "You know, if you *truly* require that a magnetic field be diverted, removed, or otherwise minimized to the nth degree from affecting a circuit or other device, there is a 100% solution ..."

I'm waiting ......

[Physicist]

I'm waiting ......

Encase the thing in a superconducting box. The Meissner effect will do the job.

[_Jim]

... if you *really* need superior magnetic shielding beyond that which mu metal would yield, then your recourse might lie in the use of a super-conducting material ...

To quote Richard Barrans Jr., Ph.D.: http://newton.dep.anl.gov/askasci/phy99/phy99x89.htm

"Superconductors exclude a magnetic field entirely. That is the physical basis for "magnetic levitation": magnetic fields actually repel superconductors."