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Ensure the Best Visual Stress Testing with Polariscope The Polariscope is the best instrument for evaluating internal stress and strain in transparent materials such as PET, acrylic, glass, and molded plastics. By using polarized light, it allows operators to view stress patterns that are not visible to the naked eye, helping prevent product failures, cracks, and deformations. Commonly used in the PET bottle industry, laboratory testing, and precision molding units, the Polariscope ensures structural safety and quality in components. Presto offers a wide range of Polariscope models, including a strain viewer for PET preforms, all designed for ease of use, portability, and crystal-clear...