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Measurement of length is very comprehensive and includes distance, displacement, position, dimensions, size, area, volume, and surface texture. This is one of the fundamental requirements in engineering and manufacturing industries and a critical part of setting up and operating many science experiments and facilities. The international expertise in dimensional measurement covers more than 12 orders of magnitude. This is ranging from the highest resolution measuring system based on x-ray interferometry (20 picometer accuracy) to a large volume, long range capability up to 100s of meters.