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This paper presents the elements of metrology laboratory accreditation for calibration in the scope of calibration E-05 dimensions, and calibration for the subject: distance and angle measures. Within the technical requirements for the competence of calibration laboratories (ISO/IEC 17025:2006), the requirements relating to the providing confidence in the quality of the results of the calibration are defined. Each laboratory must have the quality management procedures for monitoring the validity of the calibrations performed. This monitoring will be planned and reviewed through: internal quality control, participation in the inter-laboratory comparisons or proficiency testing schemes, repeated calibrations using the same or different methods, recalibration of the saved samples and correlation of results for different characteristics of the sample. The procedure and the results of the inter-laboratory comparisons between two accredited laboratories will be described in particular: Metrological Laboratory for Angle and Length Calibration, Faculty of Civil Engineering, University of Belgrade (ML160), and Metrological Laboratory of High Construction-Surveying School to Professional Studies (MLVGGS). Comparing results are analysed within the defined criteria with pre-planned effort to solve the problem and prevent incorrect results that appear in the report. The procedures are based on the application of best practice solutions. Since the ML160 laboratory was included in the family of accredited laboratories, the laboratory staff has been putting great effort to ensure the quality of work and the quality control of the work, in accordance with the requirements of ISO/IEC 17025:2006. In order to maintain their competency the ML160 laboratory conducts internal and external quality control. This paper will present the inter-laboratory comparisons as a form of external quality control in which the ML160 laboratory has participated.

Inter-Laboratory Comparisons with the Calibration of Geodetic Instruments