This ingenious system allows to measure the internal filling level of all tanks (black, grey, clear waters and fuel), no matter their use. In fact the Gobius system replaces completely the standard internal floats thanks to the installation of external sensors (one or three). The GOBIUS sensors can be install on tanks made of whatever material. These sensors detect the tank vibrations thus measuring in detail the level of the liquid inside. The system is sold as a kit for fast and easy installation. Main characteristics and advantages: - No mechanical fault (frequent in black water tanks) - No maintenance needed - No modification or hole on the tank (no leaks) - Suitable for all materials - Working on tanks of all sizes - Suitable for new and existing tanks - CE mark.