A field-portable X-ray fluorescence (XRF) analyzer was developed and assembled at the Academy of Fine Arts in Vienna, in order to permit in situ examinations in museums, libraries and even at archaeological excavation sites. The system is based on energy dispersive XRF using an Oxford XTF5011 50W-Rhodium X-ray tube, a Röntec XFlash 1000 silicon drift detector, and two lasers for positioning. All devices are controlled by a software package based on National Instruments LabVIEW. Additionally, the readout of the acquired data, preliminary qualitative evaluation, and a convenient presentation can be carried out by the self-developed software. Subsequently, the stored data can be analyzed using conventional software such as WinAxil from Canberra Eurisys. The overall miniaturization of the devices used enabled an easily portable computer (laptop)-controlled system for objects of art and archaeology. In recent years comparable instruments have been built by research institutes and companies. However, the software developed for our instrument seems to be unique and fulfills the requirements for the nondestructive analysis of artifacts. The poster will describe the self-built instrument with its devices and software package and present these case studies: wall paintings of the Romanesque and Baroque periods in churches and cathedrals in and outside Vienna; analysis of gold objects of the Arthemision in Efes/Turkey; pigment analysis in medieval manuscripts of the St. Catherine Monastery on the Sinai/Egypt.