In 2015 Operator Logistyczny Paliw Plynnych Sp. z o.o. (OLPP) extended the range of services to flow/mass meter calibration and flow/mass meter verification performed with its participation by local metrological authorities and notified bodies as part of external audit.
The calibration or the verification is performed under working conditions with a mobile prover whose expanded uncertainty is 0.052% (at a level of confidence of 95% and coverage factor k = 2). In 2016 Polish Central Office of Measures issued the metrological expertise certificate of the above mobile prover that is proof of reliability of the calibration and verification performed by OLPP Measurement Centre and confirmation for OLPP Clients that the results of the calibration are related to measurement standards and the inspected system is entered in the existing measurement system of the country.