As a side note - and to be picky - degaussers are AFAIK not really-really "certified" by NSA, they are only listed:
https://www.nsa.gov/Portals/70/documents/resources/everyone/...
With what looks like a disclaimer: > The Degausser EPL (Evaluated Products List) specifies the current models of commercial equipment that satisfy NSA/ CSS requirements for erasure of magnetic storage devices retaining any level of classifed or sensitive data. Listing on the Degausser EPL does not constitute endorsement of the product by the USG or NSA/CSS; it only states that the evaluated degausser has met the applicable NSA/CSS performance requirements. Neither does the listing guarantee continued performance; customers should have their equipment re-tested periodically according to the manufacturer’s recommendations.