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A polariscope is a crucial optical testing instrument used to analyze internal stresses in transparent materials like glass and plastics. It operates by using polarized light to detect birefringence, which reveals stress patterns within the material. This tool is widely used in industries such as packaging, automotive, and scientific research to ensure product quality and durability. By identifying hidden defects, a polariscope helps manufacturers improve the strength and reliability of their products. Whether for quality control or research, this device plays a vital role in preventing failures and ensuring high standards in material testing.