I'm a fairly technical guy that appreciates precision when it's needed. I'm at a loss as to why I would (should?) be concerned about a .2ppm change in anything. I have easily kept my pool balanced enough to enjoy using test strips of various manufacturers. I presently use Aqua Chems 6 way strips. I do agree with using them as go no-go gauges. My interest in getting a good test kit is more from an economic interest, in that the fun now is to keep it balanced for the least amount of money. However; I still do not see me ever making .2ppm adjustments. What am I missing?

Glenn in Toronto