Section 2.2.1 of the Guide to the Expression of Uncertainty in Measurement (GUM) defines ‘uncertainty’ as:
“...doubt, and thus in it’s broadest sense ‘uncertainty of measurement’ means doubt about the validity of the result of a measurement.”
NIST Policy on Uncertainty Statements
Appendix E of NIST Technical Note 1297-1994 states that “a measurement result is complete only when accompanied by a quantitative statement of its uncertainty.
This policy requires that NIST measurements results be accompanied by such statements and that a uniform approach to expressing measurement uncertainty be followed.
Uncertainty is to be reported at a 95% confidence level or k=2”.
INNOCAL Policy on Uncertainty Statements
InnoCal includes statements of uncertainty on calibration certificates when requested by the customer or if the customer requests a calibration with requirements from ISO 17025 or ANSI Z540.
InnoCal is constantly working at improving its processes and measurements and is committed to providing uncertainties for all measurements performed regardless of their inclusion within our scope of accreditation.
A2LA Scope of Accreditation (234K .pdf)