Sefind designs and manufactures access counting systems. An example is related to the access counting of toilets of the “Leonardo da Vinci” airport of Rome Fiumicino. The system is composed by a server which queries all remote devices, collects data, stores it on a protected database and shows status of toilets of the entire airport on the various supervision clients, highlighting all useful information such as number of in and out, malfunctions, obstacles present.