Conditionmonitoring(CM) is a indispensable part of todays productions. Overtheyears, countless studies have been published on individual issues in the area of CM, but there is no summary of machine elements and their wear processes. Anyone new to the eld is hindered by the abundance of scientic articles on wear attempts and the lack of clarity on a fast CM-solution. This diploma thesis presents an overview on the current („state of the art“) sensors for measuring wear on machine elements. Inparticular, it combines machine elements with the most common types of wear, with the resulting eects and last but not least the sensors, which are particularly suitable for wear measurement of these machine elements according to the current state. Unlike other works, where often only one machine element has been analyzed, a large number of machine elements in connection with the wear-measuring sensors are reviewed and shown in a table. This allows the reader to understand the currently used methods of wear measurement while learning alternatives. In addition, by providing the sources, the opportunity for deeper research is given. The literature research focuses on wear, which is caused by mechanical stress. Chemical wear and erosion are not dealt with. The work raises the question of whether one can conclude from a wear eect on the most suitable sensor for measuring this eect,or if there are other criteria for dierentiation. In addition, the applicability of results from laboratory experiments in the real environment is discussed. The results were evaluated by means of expert interviews in which open questions were answered and further interesting points of view were addressed.