Which, being where I currently am, is exactly what I do as it happens! However, in er, other places, I suspect the test weights have to be certified to have been tested against a tracable 'sub-standard', which in turn is tracable to...you get the idea

I'm all for doing a professional, accurate job with everything I do, but sometimes things seem to be taken a little 'O.T.T'. When you see hospitals, clinics etc with basically nothing, and desperate people being turned away because they can't be helped if there is 'nothing'..well, it does seriously change one's perspective on things!
Rant over!