When evaluating supplement elements, which quality is ensured by instrumental and visual observations?

• A. Accuracy
• B. Timeliness
• C. Precision
• D. Completeness

Answer: (A)

Accuracy is about how close the measurement is to the true value defined by the standard. Using calibrated instruments provides a quantitative measurement tied to a reference, while visual checks verify that the element’s physical attributes meet the specification. Together, these observations confirm that the measured value reflects the actual (true) value, not just that data were collected on time or that measurements happen to be repeatable. Timeliness and completeness relate to when and whether all required data are gathered, and precision concerns the repeatability of measurements. The primary role of instrument readings and visual inspection in this context is to ensure the measurement is correct relative to the standard, i.e., accurate.