I'm with Dale on this -- relax, have a home brew. Generally speaking, your scale doesn't have to be that accurate. Within a tenth of an ounce (or a few grams) is fine, and just about every scale out there is better than that. If it isn't, then it is probably not very sturdy, or doesn't have the features you want, so you don't want it anyway.
Personally, I have a couple scales. One is for luggage, and the other is for my gear. The luggage scale is handy for answering the "So what does your pack weigh?" question. In general, I don't care, but I weigh it on the way out the door (which means it has food in it) and I always forget to weigh my pack after a trip. I carry what I consider to the best compromise for me -- I'm really not trying to win an ultralight competition here. But my friends always ask, so it is nice to have an answer for them.
For a gear scale, a difference of a few grams isn't going to change your decision making. The breakthrough comes when you weigh something and compare it alternatives. I can't imagine exchanging something for something else (or leaving it at home) if it weighs 16 grams versus 17.
I can see why Dale bought one scale to do it all. It is handier than my scale, which was probably only a few cents cheaper. Mine can only handle around five pounds at the most. Generally speaking, that isn't a problem for ultralight hiking, but it limits the overall usability of the scale.