Our advice
Control the reliability of your measurement and test results: repeatability and reproducibility of analysis methods

Measurement uncertainty has not been part of our culture since 1837, when the State created the Service des Poids et Mesures to guarantee fair trade. This guarantee is essentially based on the periodic verification of measuring instruments, without taking other factors into account. For fairness, that's more than enough...

On the other hand, to guarantee the relevance of a decision based on a measurement, knowledge of the measurement uncertainty is essential. And this measurement uncertainty is the result of many factors, not just the measuring instrument. Indeed, it's not uncommon for a simple repeatability/reproducibility test between operators to reveal a very substantial proportion of the said operators. In such cases, it will...