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PTC is an innovative high-tech company based in China. We are specialized in providing solutions of Stress Measurement and Automated Optical Inspection areas. In the section of stress measurement , not only do we provide affordable strain viewers but we also supply high-resolution computerized Polariscope . Glass , Crystal , acrylic, PET and many more transparent materials are detectable. <a href="https://www.ptc-stress.com/">Surface Stress Meter</a>