There is provided a measuring system for acquiring measured values for fill level, measured values for pressure, measured values for flow, or measured values for density, the system including a central server and a plurality of measurement devices, which are connected to the server via the internet. A mobile device is also provided, which receives identification numbers of the measurement devices and transmits the identification numbers to the server, whereupon the server transmits the corresponding measurement data to the mobile device. As a result, it is possible to facilitate the assignment of measurement sites to a customer in a web portal.