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A photoelectric diameter gauge is a device used for measuring the outer diameter; it is used to determine the outer diameter of various rolled materials. This article will provide a brief overview of its measurement range. The measurement range of an instrument refers to the range of values defined by the upper and lower limits within which the instrument can measure the rolled material in question, with the required level of accuracy. What is the measurement range of an optoelectronic diameter gauge? Commonly, it ranges from 0-15mm, 0-40mm, 0-70mm, 0-90mm, and so on. There are also some others with different measurement ranges that can be customized. Such as 20-150mm, 260-400, 60-600, 60-900, and so on. Everything can be customized. As for the upper and lower limits, the lower limit allows for measurements down to 0.1 mm, while there is no limit on the upper limit; the measurement range can be set to match the size of the rolled products being produced. As an optical measuring instrument, it is very difficult to expand its measurement range; doing so involves challenges related to existing technologies as well as increased costs, and more importantly, it leads to a reduction in measurement accuracy. So, how does the photoelectric diameter measuring instrument mentioned in this article manage to measure extremely large diameters? Let the editor give a brief explanation below. When the diameter of the rolled material being measured is large, using a single-tube probe with a large diameter results in very high costs, and it also reduces the measurement accuracy of the diameter measuring instrument; therefore, this design employs a dual-tube probe for measurements. Two sets of transmitting lenses emit parallel light beams toward two sets of receiving lenses, and the lenses within these receiving lenses cause the parallel light beams to form an image on the photoelectric conversion element, namely the CCD chip. When an object under test is placed between two parallel beams of light, shadows appear on the image formed by the photoelectric conversion element, with widths L1 and L2 respectively. By processing and calculating the electrical signals generated by the photoelectric conversion element, the dimensions A1 and A2 corresponding to L1 and L2 can be determined. Adding A1 and A2 together with the net distance B between the two lenses yields the dimension D of the object being measured. Moreover, for the inspection of rolled products in various specifications, a dual-probe technology with adjustable spacing can be employed; this large-diameter diameter measuring instrument is capable of automatically adjusting the measurement range (it can also be adjusted manually) to achieve inspection of multiple specifications. Of course, different measurement ranges come with varying levels of precision; the current precision level is ±0.003 mm. As the measurement range increases, the precision decreases slightly, but this still meets the measurement requirements for most rolled materials. In summary, the measurement range of an optical diameter meter is determined based on the specifications of the rolled products being manufactured; it must be sufficient to cover all such specifications so that various types of rolled products can be measured. Additionally, the optical diameter meter can also be used to measure width dimensions.