CENTER OF METROLOGY AND LABORATORY SERVICES (CMLS) is a specialized Ukrainian company. Main activities: independent provider in the field of interlaboratory comparative testing and proficiency testing (PT), ISO 17043 provider, support of laboratory activities in the field of dissemination of the requirements of the international standard ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories and its identical DSTU EN ISO/IEC 17025:2019 (EN ISO/IEC 17025:2017, IDT; ISO/IEC 17025:2017, IDT) General requirements for the competence of testing and calibration laboratories.