Almost all manufacturing industries have the calibration process in place in their production process. But why do they undertake the calibration of instruments? It assures the instrument is giving accurate results and trace measurements. Companies hire calibration service providers and experts to get reports of errors with the measuring device before and after the calibration. The main parameter for calibration is accurate scaling besides calibration is performed to ensure zero error in a completely closed position, flatness and parallelism of the measurement.