Metrology, the science of measurement, is gaining prominence in Europe as the region aims to shift towards a greener economy with a focus on hydrogen as a clean energy solution. Accurate measurement of hydrogen flow is identified as a critical factor in the successful integration of hydrogen technologies into existing energy systems. European initiatives like Met4H2 are working towards developing measurement standards to support the safe advancement of hydrogen-related technologies, aligning with Europe's target to increase the market share of hydrogen from 2% to 14% by 2050. In addition to hydrogen, metrology plays a vital role in various other areas such as quantum security and battery recycling. Projects like MeTISQ are addressing quantum communication security challenges, while initiatives like LiBforSecUse are focusing on accurately measuring impedance in lithium-ion batteries for efficient recycling and secondary use. Metrology's significance is commemorated annually on World Metrology Day, emphasizing the importance of precise measurements in everyday life and celebrating the global system of measurement established by the Metre Convention. European metrology institutes are also involved in ensuring the accuracy of fuel dispensation at petrol stations and studying advanced technologies like quantum key distribution to enhance digital communication security. The diverse applications of metrology highlight its essential role in promoting sustainability and innovation across various sectors. Through collaborative efforts and research projects, metrologists are paving the way for reliable measurement practices that underpin advancements in energy, technology, and environmental sustainability.