The MSTP was designed by the Home Office and NPSA, and forms part of PAS97:2021 for monitoring the image quality of security x-ray scanners used for mailscreening.
The MSTP is recommended for checking that your mailroom x-ray system continues to perform to the expected standard and in compliance with PAS97:2021.
The UK Mail Screening Test Piece (MSTP) – A Guide gives a description of each individual test outlining the purpose of the test, its applicability to both conveyorised and/or cabinet X-ray systems, and the particular relevance of the test to mail screening.