Mu-Metal Sample Holders: Three Mu-Metal shield assemblies that each consist of three cylindrical cans, and lids, which provide a very low magnetic field volume to store samples before and during demagnetization runs. The cans were constructed and designed by Amuneal Corp. in Philadelphia, PA. The center of the cans have fields of near 1.0nT, which grades to around 15nT at the shield edge.