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A polariscope is an optical device used to analyze stress patterns in transparent or translucent materials, such as glass or plastic. It operates by passing polarized light through the material, allowing users to detect internal stresses that are not visible to the naked eye. This tool is commonly used in industries like packaging, automotive, and glass manufacturing to ensure material quality and integrity. By using a polariscope, manufacturers can identify weak points or structural defects, ensuring the safety and reliability of their products before they reach consumers.