Through the use of their Smartphone (an instrument that nowadays almost never lends itself to someone else) combined with the functions made available by the PC station present in the survey location, a member of the staff will be able to mark, the entrance or the output, with the simple reading of a QRcode displayed on the video through the camera of the device.
The QRcode, which identifies the place where the reading takes place and the time of detection, is automatically changed periodically and a control system will prevent any illegal detection.