I'm not an inspector and never worked in this industry. Accordingly to published data, they must compare (by conversion accurate to at least six sig. figures) the two declared contents and determine which claim is larger. They then test to that claim, using a sample average and statistics to determine whether there is a problem.
I hope it more rigorous than the DoE, which seems to let the petroleum industry make their own rules and do as they wish. However, I would guess that in many cases, they review the manufacturer's own quality control program, and if his program passes muster and he has sufficient data, that they simply review that. (I would hope they reserve the right to sample inspect just to keep him honest.) ________________________________ From: "[email protected]" <[email protected]> To: [email protected]; U.S. Metric Association <[email protected]> Sent: Sun, May 16, 2010 3:56:36 PM Subject: Re: [USMA:47387] Re: A silly milliliter--Coca Cola commemorative What do inspectors of "net contents" actually do? NCWM prescribes a tedious statistical process of maximum allowed deviations from mean values from selected samples of a product. Are the measured values the SI values or the non-SI values? Is there first a comparison of declared values (SI vs non SI) on the labels of the product to determine the larger? What is taught in NIST certification courses for inspectors? Are inspectors allowed (legally) to do the analysis only on samples bearing the larger declared value? What do inspectors actually do before and after certification? ---- Original message ---- >Date: Sun, 16 May 2010 02:46:00 -0700 (PDT) >From: "John M. Steele" <[email protected]> >Subject: [USMA:47387] Re: A silly milliliter--Coca Cola commemorative >To: "U.S. Metric Association" <[email protected]> > > Then I must play the Devil's Nitpicker. > > Both the Customary and metric claim must be true in > the sense that average net contents must equal or > exceed the claimed amount...
