degaussers require adequate shielding of the magnetic field they constantly have to prevent unintended degaussing. The need for shielding usually results in permanent magnet degaussers being bulky. When small-sized, permanent magnet degaussers are suited for use as mobile degaussers. See also Data remanence References External links Guide to degaussing TVs https://degaussing-101.com/what-is-degaussing/ Computer storage media Magnetic hysteresis British inventions