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Countries around the world have always attached great importance to the field of straightness measurement, and continue to develop new high-precision methods and devices for such measurements in order to meet the increasing demands for product quality. Currently, both domestically and internationally, measurement accuracy in areas such as roundness, parallelism, and surface roughness has already reached the nanometer level. However, the measurement accuracy for straightness is not high; especially when it comes to measuring straightness over long distances, this accuracy is far inferior to that of other measurement parameters. It is of great significance to study domestic methods for straightness measurement. Straightness measuring instrument: http://www.bdlanpeng.com/repository/image/fkah51NKTpm1lJZYf*Lhw.jpg?k=1561028603000 There are two requirements regarding the process of measuring straightness as well as the measurement results: one is the requirement for accuracy, that is, the measurement results must reach a certain level of reliability ； The second is the economic requirement, which means that, while ensuring the accuracy of the measurement results, the measurement process should be simple and economical, with minimal costs. To meet these two requirements, new types of measuring instruments that integrate advanced technologies such as light focusing, mechanics, electronics, and computing should be used to carry out real-time, rapid, and contactless measurements; this will represent the direction of development for modern straightness measurement techniques. For long-distance rod, wire, and tube products, developing online automated straightness measuring instruments holds great practical significance for manufacturers. In this approach, 3 sets of photoelectric diameter gauges are used in combination to achieve high-precision online detection of straightness, thereby enabling the measurement of straightness on-line. The straightness measuring instrument uses an optoelectronic diameter gauge for testing, thereby enabling simultaneous measurement of both diameter and straightness. One device fulfills the functions of two devices; it is simple to operate and easy to use. It is a non-contact, online automated testing device that checks the straightness and outer diameter quality right from the production stage, allowing for timely awareness of the production status. This enables prompt adjustments when defects are detected, which is of great importance for ensuring high-quality production and improving efficiency. During diameter measurement, the 3 measuring instruments can simultaneously measure the outer diameter, displaying the real-time measurement values of all 3 at the same time. Normally, only one of the measuring instruments is selected for real-time outer diameter measurement. Straightness measurement requires 3 measuring instruments to operate simultaneously to collect data and calculate the straightness. Diameter measurement and straightness measurement are combined in one device; the measurement functions are separate, but they can be carried out simultaneously. The measurement accuracy of the straightness tester is ≤0.03mm, and the measurement frequency of the measuring unit is 500–1000HZ. An electronic synchronization control unit is used to enable simultaneous sampling of the three devices, allowing for continuous monitoring. Based on the measurement data, the straightness of the entire wire, rod, or tube can be determined. The installation positions of the devices on the left and right sides can be adjusted according to specific requirements. A straightness measuring instrument is a measuring device that is easy to use, stable and reliable, and highly accurate. It also continues to integrate this field with contemporary cutting-edge disciplines, drawing on and adopting new ideas and methods from related fields, in order to gradually improve the level of straightness measurement in actual production environments, thereby developing straightness measuring instruments with higher quality and better functionality. A straightness measuring instrument is a high-quality inspection device with great application prospects. We are also committed to developing even higher-quality straightness measuring instruments for use in various fields, thereby ensuring quality control.