ISO/IEC 17025

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Need to perform an internal proficiency test or interlaboratory comparison? Use this calculator to evaluate your results; calculate Normalized Error (En) and Z-Score per ISO/IEC 17043.


Estimate uncertainty for any test or calibration with this uncertainty calculator for excel. Plus, use the included CMC Uncertainty calculator to get uncertainty equations for your scope of accreditation. The perfect calculator for beginner, advanced, and expert users.