Calibration of the measurement and determination of the accuracy of the measuring instrument is in accordance with the approved reference. In other words, the passage of time, Exhaustion, unpredictable events, cause the traceability of the analyzers to be questioned by the standard and need to be re-verified. Since according to international standards, measuring devices must be calibrated periodically, so the maintenance department of the Piramoon System Qeshm, in the format of current contracts of client or in some cases with cross-sectional requests, provides calibration service with experienced and up-to-date experts and tries to be accurate and the reliability of the results of these measuring instruments is maintained at a high level.