The measurement of hydrocarbon fluids, with an overall measurement accuracy that is acceptable to all involved parties, is a goal most gas measurement organizations strive to meet. The achievement of overall measurement accuracy can be visualized by using an image of a steel chain. One side of the chain is fastened to the true quantity that passes through a measurement point. The other side of the chain is fastened to the observed quantity passing through the measurement point. If all of the links of this theoretical chain are strong, the observed reading will be held very close to the actual reading. If there are weak links in the chain, a difference in the true reading and observed reading will be experienced