As the energy sector evolves towards a more sustainable future, blending hydrogen with natural gas in existing networks has emerged as a pivotal strategy. Hydrogen distinct properties, from density to sound speed, introduce new variables and challenges that traditional metering technologies struggle to navigate. Ultrasonic flow meters accommodate the variability in gas compositions, ensuring accurate measurements across a spectrum of hydrogen-natural gas mixtures. With these devices, industries are not just measuring flow rates; they're ensuring the operational integrity of their networks, facilitating the seamless integration of renewable hydrogen, and paving the way for a more sustainable future. The Rosemount™ SeniorSonic 3414 and 3418 Gas Ultrasonic Flow Meter ensures blending of hydrogen into their current pipeline at levels of up to 30% while maintaining custody transfer accuracy and reliability.