Fingerprint Readers Types There are 4 types of fingerprint readers that exist today. These are: Capacitive readers, reads fingerprint using capacitors that provides electrical current that forms an image of the fingerprint. It is expensive than optical readers. Capacitive reader requires a real fingerprint shape rather than only a visual image, but slow in identification compared to optical readers.Optical readers incorporates a sensor that takes a snapshot image of the fingerprint.
Anti-passback system is a feature of access control system that prevents an authorized user to go in more than once, (or go out more than once) of a security controlled area. As a rule, a corresponding “IN” must have a matching “OUT” from the system. However, an access control system equipped with anti-passback must check the door if it was opened after authentication, otherwise, the record must be deleted automatically