Contemporary comparators for levelling staffs in Europe

Comparator is special device with which procedures are being done, which results define accuracy of construction and activity of levelling equipment. These procedures are called comparation or calibration and they are being done because, the equipment checked only so, can achive the required precision for the particular tasks of the precise geometric levelling. Tests can be done for precise levelling staffs with line or code graduation and for digital levelling systems, that consist of digital levels and code levelling staffs. In dissertation I first introduced procedure of geometric levelling and levelling equipment, where I described digital levels and code levelling staffs more in detail. I defined comparation and calibration then and explained urgency of these procedures. At description of comparators is particularly presented device, that is located on Faculty of Civil Engineering and Geodesy in Ljubljana. Also calibration procedure and its results are explained in detail. At the end of dissertation did I also described method of controlling the quality of different comparators and of different calibration procedures