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In automated production, most of the tasks are carried out by machines, with humans responsible for supervision and some other tasks. As automation advances, manufacturers place an increasing emphasis on quality; measurement and control instruments are incorporated into the production lines, enabling the production of higher-quality products in larger quantities, faster, and to a higher standard. For measurement and control, they complement each other; only with real-time, high-precision dimension data can it be transmitted to the control system for regulation. The importance of real-time monitoring is self-evident – manual inspection is slow and cannot provide data to the control system in real time. This is especially true when dealing with rolled materials that are prone to deformation or are exposed to high temperatures, as manual inspection becomes even more delayed. It can be said that the use of measuring instruments for real-time dimension detection is an essential component of automated production lines. For control systems, measurement is essential; the more accurate and timely the data provided, the quicker the control system can respond, resulting in better quality. There are generally three control methods, illustrated here using an outer diameter measuring instrument as an example. 1. Manual adjustment: When defects are detected, the machine is stopped for manual adjustment; with the addition of automated testing equipment, adjustments can be made more promptly as well. 2. The production line itself is equipped with a control system; in this case, it is sufficient to install an outer diameter measuring instrument on the production line and transmit the measured data in real time to the control system, thereby enabling automatic control. 3. The diameter measuring instrument comes with its own control system. Diameter measurement systems such as those with a single channel and those with two channels can have built-in control functions, including a PID regulation system. They can be connected to frequency converters, electronic speed controllers, etc., and by controlling the speed of the traction machine or extruder, it is possible to regulate the outer diameter. It is worth noting that this type of control device operates on a closed-loop basis, resulting in more accurate outer diameter measurements and better production quality. The above is a brief introduction to control systems. In fact, detection and control complement each other, working together to achieve mutual benefit; with the use of both, the quality of the rolled products improves, and over time, manufacturers also see greater profits.