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When it comes to online diameter testers, they are one of the essential devices for checking the quality of circular rolled products. They enable online inspection of various rolled products that are difficult to inspect under high or low temperatures, and they also analyze and summarize the data, providing a clear and intuitive viewing experience. Online diameter meters can be used for high-quality inspections in various harsh environments. Its five outstanding features bring great convenience: it enables real-time monitoring of production conditions, allows access to historical data at any time, provides analysis charts, and facilitates timely adjustments to the rolling mill. It is an essential device for achieving high-quality and efficient production. Display function: It displays measurement data, curves, and defects in real time, with a display response time of less than 0.2 seconds. Display: The outer contour dimensions, limit values, average values, eccentricity, and cross-sectional views of the object under test in 8 directions at the same time, as well as the trend chart of dimensional variations and a defect analysis chart. On-site LED display: Thresholds and ellipticity of measurement data at the same moment. The display frequency is 0.66 to 3 times per second. Alarm function: When the measurement data and the temperature of the measuring vehicle exceed the set ranges, audible and visual alarms are triggered simultaneously (for out-of-range values and excessive temperatures). Defect detection function: It can identify common defects in rolled products, such as ears, misaligned rolls, and material shortages. Data storage function: Allows storing and querying measurement data. The measurement data is stored in a database, making it convenient for users to retrieve, analyze, and statistically process it. Data transmission function: The system provides 2 TCP/IP interfaces, allowing users to access the database directly through these interfaces or connect an external computer to view the measurement data. These five basic and practical functions ensure its superiority in detection tasks; additional functions can also be added to it. The online diameter tester enables high-quality online inspection and provides an out-of-tolerance alarm function, allowing one to know the production status without the need for constant monitoring – making it a convenient and useful device.