Calibrated instruments are tools that have been adjusted to ensure their measurements are accurate and reliable. This process involves comparing the instrument's readings to a known standard, often referred to as a calibration standard. By making necessary adjustments, the instrument can provide precise measurements, which is crucial in fields like science, engineering, and medicine. Regular calibration is essential to maintain the accuracy of these instruments over time. Factors such as wear and tear, environmental changes, or improper use can affect their performance. Therefore, routine checks and recalibrations help ensure that instruments like thermometers, scales, and pressure gauges continue to function correctly.