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HENGXIANG green light filter-quartz window At Shanghai Hengxiang Optical Electronics Co,ltd., our professional team has decades of experiences working with quality green light filter-quartz window. We have dedicated to substantial resources to achieving our many quality certifications. Each product is fully traceable, and we only use materials from sources on our approved vendors list. We’ve taken rigorous measures to ensure that only superior quality material can be put into the production.low cost optical encoder,optical encoder position sensor,optical motor shaft encoders.