The Siglent SEM5012A is a 2-port Electronic Calibration (ECal) Module designed for efficient and precise calibration of vector network analyzers (VNAs) across a frequency range of 9 kHz to 9 GHz. Equipped with SMA female connectors and USB 2.0 interface, it ensures seamless integration with Siglent's SHA800A, SVA1000X, SNA5000X, SNA5000A, and SNA6000A series VNAs . The module simplifies the calibration process by reducing manual connections, thereby minimizing connector wear and potential human error. Its LED indicators provide clear status updates, ensuring users are informed when the device is ready for operation. Compact and lightweight, the SEM5012A is ideal for both laboratory and field applications, offering a reliable solution for maintaining measurement accuracy in RF testing environments.