Okay, I read on this forum that the Lamotte test strips are the best...I have some. Is it just me, or do they change color right before your eyes? As in, you have to dip them at the perfect depth, for the perfect length of time, and then read the results after the perfect length of time?
Honestly, these strips are useless to me. Depending on when I look, I might have 10 ppm or 80 ppm.
I think the open-loop Pool Math page is much more useful here.