The BMG Electrolyzer Stack Testing System enables innovative, efficient, and safe end-of-line testing for PEM electrolyzer stacks >1 MW. It ensures the safety and performance of this key hydrogen production technology through automated contacting at the anode, cathode, and power supply. This automation reduces test time, increases accuracy, and minimizes human error. A cutting-edge explosion protection concept ensures safe operation, tailored to hydrogen-specific requirements. The flexible testing software adapts to various test protocols and offers customizable data evaluation, supporting quality assurance in stack production.