The overall objective of the project is to increase knowledge about the accuracy and durability of commercially available gas meters after exposure to renewable gases (biogas, biomethane, hydrogen, syngas and mixtures with natural gas). This should lead to the improvement of existing meter designs and flow calibration standards. The project started in June of 2019 and will last for 3 years, and is funded by the European Metrology Programme for Innovation and Research (EMPIR).