An electronic card access system, for example, for managing access control of a venue or facility, and an access card for use with the card access system

A code scanner is provided for capturing visual codes at the bottom of a plurality of test tubes in a tube rack. The scanner comprises a base and a tube rack support mounted to the base for supporting a tube rack. At least one camera is focused on an object plane at the bottom of the tubes. A transparent cover glass is arranged between the camera and the object plane. The tube rack support has a viewing opening and, at several locations around the viewing opening, support members for laterally supporting the tube rack. The cover glass is located at a distance from and below the support members. Thus, it is less likely to acquire dirt and any dirt thereon will be out of the object plane of the imaging optics.