The automated test rig for ignition coils hums softly as it completes its cycle, the continuous acoustic signal from the WM tone generator confirming the system is operational. This device ensures that every component meets safety and performance standards before proceeding to the next stage. In automotive components manufacturing, the WM tone generator is fitted to diagnostic and testing equipment, providing auditory feedback during critical phases of quality control. Its role is to alert operators when a test sequence is running or when a fault is detected, ensuring timely intervention. Installed on production lines and in maintenance stations, the generator supports consistent monitoring of electrical systems, enabling swift troubleshooting and reducing downtime. It is also used in compressed-air systems and conveyor controls, where reliable signaling is essential for safe and efficient operations. The presence of this device enhances the reliability of testing procedures, maintaining high standards in the assembly of automotive parts.