The Mail Screening Test Piece (MSTP) is a new security customized tool dedicated to Mail Screening.
The MSTP has been designed by the Home Office Centre for Applied Science and Technology (CAST), at the request of and in association with CPNI, for mail screening applications to monitor X-ray system image quality.
The MSTP should be used for regular checks on the Mail X-Ray machines to make sure the equipment is up to standards.

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