Hydrogen currently serves as a significant and widely utilized process chemical and is also discussed as a big scale secondary energy carrier. The continual development of electrochemical components, such as electrolyzers and fuel cells, ensures that hydrogen is poised to establish itself as a sustainable and renewable secondary energy carrier within future energy grids. Precise measurement methods, particularly electrochemical impedance spectroscopy, play a pivotal role in characterization and development. Despite the existence of EIS-based measurement systems on the market, these do not consistently meet all the requirements set forth by HyCentA Research GmbH. The main goal of this thesis was the overhaul of an EIS measurement device which has been developed in a former research project The circuit diagram of the prototype was analysed, modernised, and expanded with additional functionalities. The measurement path, encompassing filters, preamplifiers, and ADC`s, was revised. A fundamental device concept was devised, including the housing, connection technology, and all electronic modules. Calibration procedures and an operational strategy for the overall measuring device, designated as the "Cell Monitor," were developed. The conceptual framework is presently in the process of implementation, with the Cell Monitor designed to serve in both testing facilities and as an onboard measuring device for fuel cell vehicles. The prospective application of the Cell Monitor significantly contributes to the advancement and optimization of hydrogen-based technologies.