Wired validation systems offer clear advantages in certain applications—such as processes with extreme temperatures or when the highest real-time measurement accuracy is required. We highlight typical use cases for thermocouples, distinguish between wired and wireless systems, and address the challenges of handling and sensor placement. Regulatory requirements (e.g., GAMP5, FDA 21 CFR Part 11) as well as best practices for implementation and documentation are also covered. The goal is to provide users with a solid basis for choosing the most appropriate measurement strategy.