Standards of measurement are established quantities used to ensure consistency and accuracy in measuring various physical properties, such as length, mass, and temperature. These standards provide a common reference point, allowing different measurements to be compared and understood universally. For example, the meter is the standard unit for measuring length in the International System of Units (SI). There are different types of measurement standards, including primary, secondary, and working standards. Primary standards are highly accurate and are used to calibrate secondary standards, which in turn are used to calibrate working standards. This hierarchy ensures that measurements remain reliable across different applications and industries.