They are used to spot-check the performance and verify the calibration of analytical balances, precision balances, and general-purpose scales in research laboratories, educational settings, and other working environments. Products may be constructed of aluminum, stainless steel, brass, iron, and other alloys.Ĭalibration weights (also known as reference weights or test weights) are manufactured to meet high tolerances and accuracy. Accurate and stable reference standards for calibrating weighing equipment, including variously certified/accredited weights and weight sets from different classes.