I agree with you as well. However, PH doesn't need to be that exact. Is there that big of a difference between 7.4 and 7.8 as far as the pool is concerned. Seeing the color difference between 7.4 and 7.8 is actually not all that hard for me. I test PH a few times a week and once it is easy to see that it is above 7.8, I go ahead and dose with acid. When I do dose, I aim to lower to 7.5 from 7.8 that way if I overshoot I still have some wiggle room.