Calibration weights are standardized weights used to ensure that scales and balances provide accurate measurements. They come in various sizes and are made from materials like stainless steel or brass. By placing these weights on a scale, users can check if the scale reads correctly, helping to maintain precision in measurements. These weights are essential in many fields, including science, manufacturing, and trade. Regular calibration with these weights ensures that instruments remain reliable over time, which is crucial for tasks that require exact measurements, such as in laboratories or when weighing products for sale.