What is a specific measure to which other measures are compared to ensure

In order to adjust for the different and unique sizes of people, standards were created.  The specific measure to which other measures are compared to ascertain uniformity is termed as the standard of measurement. Usually, measurements are presumed accurate when they are majorly agreed upon. There are different systems of measurement that were created to ensure the uniformity of sizes such as the metric system and the FPS system for the U.S. The metric system includes measurement standard such as grams, seconds and celsius.