The organization shall determine the monitoring and measurements to be undertaken to provide evidence on the conformity of product to determined requirements. Where necessary to ensure valid results, measuring equipment shall:
• be calibrated or verified at specified intervals against measurement standards traceable to international or national standards.
• be adjusted or re-adjusted when necessary.
• be identified to enable the monitoring of the calibration status.
• be safeguarded to avoid adjustments that could breach the calibration status.
• be maintained under conditions preventing damage or deterioration.under such control must be:
• oscilloscopes, multi-meters, counters, and other measuring instrument used for maintenance/repair works, and
• generators of signals used for calibrations.