This electrochemical in-situ test cell is developed for real-time characterization of electrode reactions in conventional and non-aqueous systems. With a working distance of 3 mm between the window and sample, it offers a compact optical path suitable for spectroscopic techniques. The sample reaction area measures 10 × 10 mm, providing a standardized platform for material evaluation, while the effective window diameter of φ40 mm enables broad optical access. The cell’s overall dimensions of 87 × 70 × 20 mm allow integration into standard laboratory setups. Designed primarily for experimental materials and energy storage research, this cell supports in-situ studies of electrode processes, such as charge transfer and phase transformations, under controlled electrochemical conditions. Its construction ensures compatibility with analytical electrodes and a range of non-aqueous electrolytes, making it a practical tool for studying advanced battery materials and catalytic interfaces.