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Memory Alpha

An MK-7 scanner was a Cardassian security device used to verify identity. The MK-12 scanner was a more advanced device than the MK-7.

When Vash visited Deep Space 9 upon her return from the Gamma Quadrant in 2369, she initially thought the security device in use in the assay office was an MK-7 scanner. (DS9: "Q-Less")

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