... Zygo interferometers, Perkin-Elmer Lambda 900, Radius tester, and Spectrometer ensure the quality. Our senior engineer can provide ... .Our product line includes:Plano-convex lens,Double-convex lens,Plano-concave lens,Double-concave lens,Meniscus lens,Achromatic lens, ... Glass, Fused Silica, Silicon, Ge, ZnSe, MgF2Standard SpecificationDig and Scratch: 60-40Center thickness tolerance: 0.03-0.4mmDiameter ...