Measurement methods and test procedures: Coating Geometry. This is a legacy standard that covers all current testing methods as well as some older methods for which current standards do not exist but that are still used and trusted in the industry. The document defines the methods for off-line measurement of the coating geometry of optical fibers. The parameters covered are: coating diameter, coating non-circularity, and coating/cladding concentricity error. The primary intent of this document is to measure only the overall fiber coating for the above mentioned three parameters. If more than one coating layer is present, the geometry of each layer may be measured utilizing one or more of the documented techniques.