Different variants offer flexible measurement options for the KNX bus system. The single sensor, Vari KNX T, for example, measures temperature und Vari KNX 3L sun. Combined sensors capture brightness, temperature, air humidity and pressure. The sensors include switching outputs and automatic functions, e. g. for temperature control. The version Vari KNX GPS outputs GPS position and time. The intelligent housing design enables the device to be screwed directly onto the wall, or secured to a mast with a clamp. A plug connection between the semi-transparent cover and the underside of the housing simplifies installation and connection.