Our unique STB design was adapted by this customer for bio-magnetic research in a hospital environment to study the health effects of human exposure to magnetic fields. Identical shielded and unshielded rooms were provided to the customer. The shielded room was an enhanced STB and the other was an unshielded, ‘sham’ control room. The two rooms enabled the hospital to conduct blind studies and included provisions for non-magnetic field producing lighting and instrumentation cabling.