MK-7 scanner

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. 

MK-7 scanner