... including Zygo interferometers, Perkin-Elmer Lambda 900, Radius tester, and Spectrometer ensure the quality. Our senior engineer can provide free ... A large high quality standard products are on shelf for R&D customers. Our product line includes: Plano-convex lens ... Fused Silica, Silicon, Ge, ZnSe, MgF2 Standard Specification Dig and Scratch: 60-40Center thickness tolerance: 0.03-0.4mmDiameter Tolerance ...