Per ISO/IEC 17025:2005 clause 4.11.2 a corrective action must start with an investigation to determine the root cause of the deficiency. The corrective action response must include the documented results of the root cause analysis and the Objective Evidence to indicate that the corrective actions have been implemented to address the root cause. Objective evidence should include that the measurement being provided by your accredited calibration provider is traceable, by direct calibration by an NMI or A2LA recognized accredited laboratory.

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ACS/ Marsh Metrology can provide assist you in providing Objective Evidence.