ALTIORLAB srl (LAT N.266 ) Meets the requirements of the standard meets the requirements of the standard EN ISO/IEC 17025: 2018 - General requirements for the competence of testing and calibration laboratories as Calibration laboratory for Particle size and Counting efficiency in conformity at ISO 21501-4:2018 for Optical particle counter (first in ITALY). Instruments that conform to ISO 21501-4 are used for the classification of air cleanliness in cleanrooms and associated controlled environments in accordance with ISO 14644-1, as well as the measurement of number and size distribution of particles in various environments. ISO 21501-4 describes a calibration and verification method for a light scattering airborne particle counter (LSAPC), which is used to measure the size and particle number concentration of particles suspended in air. The in force status of the accreditation may be checked in the WEB site (www.accredia.it) or on direct request to relevant Departments. This laboratory is accredited in accordance with the recognised International Standard ISO/IEC 17025:2018. This accreditation demonstrates technical competence for a defined scope and the operation of a laboratory quality management system (refer joint ISO-ILAC-IAF Communiqué dated January 2009).