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...A gpg no issue w pm page measurement good practice guide beginner s to uncertainty of stephanie bell the national physical laboratory is operated on behalf dti by npl management limited wholly owned subsidiary serco group plc centre for basic thermal and length metrology abstract aim this introduce subject every some result only complete if it accompanied statement in uncertainties can come from measuring instrument item being measured environment operator other sources such be estimated using statistical analysis set measurements kinds information about process there are established rules how calculate an overall estimate these individual pieces use as traceable calibration careful calculation record keeping checking reduce when evaluated stated fitness purpose properly judged crown copyright reproduced permission controller hmso issn august with amendments march teddington middlesex united kingdom tw lw was produced under competing precisely project awareness raising campaign within ...