Summary:

Measurements of the 3rd class of leveling network require the appropriate class of equipment. Based on researches performed in Geodesy Metrology Laboratory in AGH can formulate proposals for the economic selection of a set of equipment to perform such work. That kind of set may be digital level Leica Sprinter with 3m-length uniform fiberglass leveling staff GSS113. The coefficient of thermal expansion was determined in the thermal chamber and calibration was performed for these staffs on a vertical comparator. In accordance with norm PN/ISO 17123-2 the error of 1 km of double run leveling was determined for set of Leica Sprinter with GSS113 staffs. In some cases this set can replace more expensive Leica DNA10 level. The present research indicated the usefulness of the set for leveling the 3rd class of leveling network, indicating the essential elements for its application in practice. The paper presents a study on one set of Leica but described research methodology is universal and can be used for equipment from other companies. The main goal of this study was to provide users informations about the possibilities and limitations of their equipment.