测量设备和量具的定期校准。
但该设备必须定期校准，以确保测量精度。
However, they must be calibrated periodically to ensure they are performing as accurately as possible.
〇密码保护，只允许专管人员操作，防止非授权人改变参数，无需维护、无需定期校准。
Password protection, allowing only in charge of personnel, operating, preventing unauthorized people changed parameters, no need of maintenance, no need of regular calibration.
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