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HENGXIANG absolute optical rotary encoder-optical quadrature encoder Shanghai Hengxiang Optical Electronics Co,ltd. controls the quality of absolute optical rotary encoder-optical quadrature encoder during the production. We conduct inspections at any point throughout the production process to identify, contain and resolve product problems as quickly as possible. We also implement testing that is in line with related standards to measure the properties and evaluate performance.uv transmission filter,uv transmitting filter,neutral density filter glass.