This carbon paste electrode, developed for use in experimental and energy material research, features a polytetrafluoroethylene (PTFE) sleeve paired with a copper pressing rod. The carbon paste is directly filled into the sleeve and compacted, allowing for diameters ranging from 2 mm to 6 mm or larger, with several standard sizes available. Its reusable design supports consistent electrochemical measurements in analytical and material science applications, making it suitable for sensor development, battery electrode studies, and fundamental electrochemical characterization. The robust PTFE insulation and copper contact ensure reliable electrical connection and chemical resistance, while the interchangeable carbon paste enables flexible modification of electrode composition. This product offers a practical, cost-effective platform for researchers working with carbon-based electrode systems in energy storage, catalysis, or electrochemical analysis.