Magnetic shielding includes products and raw materials for shielding instruments and equipment from magnetic fields.  Shielding products for applications requiring a reduction or elimination of interference from magnetic fields.   Products include CRT shields, photomultiplier tube (PMT) shields, zero gauss chambers, wire, cable, conduit, sleeving, foil, sheets, and others.  They can be used to shield an object, such as a CRT or a PMT, from magnetic fields, or to contain fields from an object that generates a magnetic field.