I also have checked my U-View against the balance scale I weigh my reloads with; my U-View and 4 or 5 others I accumulated over the years. My U-View is with in one grain all the time the way I use it. none of the others are that close, and the tubes are way off and vary considerable.
I have one measure that is so far off I use it to demonstrate why all measures should be checked against a scale, it is actually over 20 gr off. It is an Italian brand since we are not suppose to knock brands I won't say any more than that but it sure makes a point when we have a kids class.
Be careful, SAFTY is always the most important thing.