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Introduction: From vernier calipers to optical projectors, from optical projectors to coordinate measuring machines, and from coordinate measuring machines to flashometers, each advancement in measurement tools represents progress in technology. A flash tester, also known as a one-button measuring instrument, benefits from the innovations and advancements in \"optical detection technology + machine vision technology\". The demand for industrial dimension inspection is growing at a rapid pace year by year. Image measuring machines are finding it increasingly difficult to handle heavy measurement tasks, which has led to the rise of flash measuring instruments. These instruments have penetrated various industries and represent a trend that is driving industrial dimension inspection into a new era. Against the backdrop of the \"Made in China 2025\" initiative, the flash tester embodies the principle of \"coming quietly in the night like the wind, nourishing things subtly without a sound.\" Compared to the flash testers of the \"new generation,\" the main players in the \"old generation\" are image measurement devices (hereinafter referred to as image meters). Below, the author will explore the differences between the \"new generation\" and the \"old generation\" from four aspects. 01 Working Principle of the “Front Wave” Imaging Instrument: It focuses on the rapid movement of the working platform; by combining CCD digital imaging data with raster displacement values, measurements are carried out through software calculations. “The “Next Generation” flash tester focuses on the overall imaging capability of dual telecentric lenses (in a photographic style); it utilizes high-resolution industrial cameras along with high-precision image analysis algorithms, and measurements are carried out through software calculations. The advent of the flash meter has overturned people’s traditional belief that measurement accuracy is proportional to the magnification of the product image! 02 Equipment Structure and Precision: The “Qianlang” imaging systems are mostly of cantilever or bridge type, requiring a large amount of space. The measurement accuracy is greatly affected by the field environment and usage time. “The “Next Wave” flash meter: Its design makes full use of spatial structures as well as human-centered design principles, resulting in a compact and delicate appearance with low space requirements. The photo-based measurement principle effectively prevents the occurrence of Abbe error, and the measurement accuracy is less affected by the field environment and usage time. https://img76.chem17.com/2/20201210/637431944068286699824.jpg03 Measurement Methods and Efficiency: The “Qianlang” imaging system uses a conventional approach in which the product to be measured is placed on a glass platform. The coordinates of the product (commonly referred to as rough coordinates) are determined by manually selecting points, after which the work platform is moved to locate the relevant elements in order to carry out the measurement. “\"Rising Wave\" flash tester: Multiple products can be placed arbitrarily within the measurement area at the same time, and product measurement can be completed in just 1 second with a single button press. The measurement efficiency of the flash tester is obvious! 04 Application Areas: Both types of devices are suitable for use in industries such as machinery, electronics, mold manufacturing, injection molding, hardware, rubber, healthcare, and mobile phones. Compared to image scanners, flash testers are more appropriate for applications that require batch testing or automatic measurement. While ensuring the required precision in product measurement, flash gauges require less skill from the operator, and their software is simpler and more user-friendly, thereby significantly improving the efficiency of product inspection – making them an ideal choice for modern industrial dimension testing that demands speed, accuracy, and reliability! Postscript: The sales volume of the Zhongtu Instrument VX series of flash measuring devices has been doubling year after year, making them a truly remarkable product in the field of industrial measurement. This demonstrates how the VX series manages to keep up with the rapid development of the market while driving innovation in measurement solutions. By focusing on the needs of users and addressing the challenges associated with dimension measurement, it is believed that these flash measuring devices will remain a reliable choice for users, providing them with consistent quality assurance and creating additional value.