Reference markers for engine components and methods of measuring the same

A system, comprising:

• a first component, the first component including:
• an edge;
• a first external surface;
• and
• a reference marker provided on the first external surface, the reference marker including spatial marking features having predetermined dimensions, the spatial marking features including (a) a first spatial marking feature at a first location relative to the edge and (b) a second spatial marking feature at a second location relative to the edge that is different than the first location, wherein the reference marker provides a first measure of the first component based on a combination of the first spatial marking feature and the second spatial marking feature and the predetermined dimensions;
• and
• a second component located adjacent to the first component.

A system, comprising:

• means for holding;
• means for directing a fluid coupled to the means for holding;
• and
• means for indicating optically visible on an exterior surface of the means for directing, the means for indicating including spatial features arranged in a pattern such that dimensions of the spatial features are predetermined, wherein the spatial features including a first spatial feature and a second spatial feature spaced apart from the first spatial feature, and wherein a comparison between the first spatial feature and the second spatial feature is indicative of a measure of the means for directing.