I don't know why it didn't occur to me before today, but a balance beam scale can be much more accurate than you would think. I dug out my grandpas 5-10 beam and started checking my chargemaster lite with it. I'd have the chargemaster throw a charge and I would transfer it to the beam. Zero the beam perfectly with that charge. Now check every charge on the beam to make sure they are the same without changing the beam weights. With my magnifying glass, I could easily resolve a single kernel up or down, which was all the chargemaster was ever off by. Pretty cool, if I do say so myself!