This product is designed for precise electrochemical characterization of membrane electrode assemblies (MEAs) in energy research applications. The four-electrode configuration allows accurate separation of working, counter, and reference electrodes, enabling reliable impedance, polarization, and durability measurements in fuel cells and electrolyzers. Manufactured by Tianjin Aida, the fixture accommodates standard MEA sizes and provides stable electrical contact and gas sealing for reproducible testing. It is suitable for laboratory-scale studies on catalyst activity, ion transport, and membrane degradation. The compact design facilitates integration with potentiostats and electrochemical workstations, supporting both fundamental research and performance validation of advanced energy materials.