One would think that a "set of test weights" should have accurate weights. It's not like this. As others have noted, the 20 grain weights are heavier, 0.3-0.4 grains in my case. 10 grains was fine, but I stopped testing test weights when I found how knocked down they were. I don't have a certified scale, but I have a beam scale and an electronic scale that told me the same thing, so I'm pretty sure I'm right. But it's a good thing, whatever the cost.
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