Calibration standards are reference materials or instruments used to ensure the accuracy and precision of measurements in various fields, such as science and engineering. These standards provide a known value or characteristic that can be compared against the measurements taken by instruments, helping to identify any discrepancies and maintain consistency. The use of calibration standards is essential for quality control and compliance with regulations. Organizations often rely on established standards from bodies like the International Organization for Standardization (ISO) or the National Institute of Standards and Technology (NIST) to ensure their measurements are reliable and valid across different applications and industries.