RE: How many have check wieght?
I picked up some as part of a present for my father a while back.
He uses them to double check his scales prior to whenever he is starting a run of ammo for a match or if he has dropped or banged around equip by accident. I actually got them fairly cheaply since I picked them up at a place that sell supplies for lab equipment near one of the nearby colleges. It was a old time calibration set for grains andgrams. Still gauranted for accuracy just not with a fancy/large company name on them. I also have a scale and weights myself that I got via a company that sells supplies for jewelry making and fine metals. Thatone came with grain, gram and troy ounce weights, all certified to .001+/-