I'm red/green colorblind so can't use color comparators. I run a commercial pool, and when I started we had a Taylor K-2005C service kit. I relied on my three non-vision-impaired workers to check the results. They frequently came up with FC higher than TC, and their results differed among themselves. So I gave up and bought a LaMotte ColorQ. (I chose that one because we have an open account with In The Swim and that's what they carry.)
TFP questions its accuracy--why, and how bad do you think it is?
I was an instrument tech for 30 yrs, and my whole career centered on the question, "Is this instrument or test telling me the truth?" I can find no accuracy specs for any of the testers, and am forced to say "It's probably close enough." The wobbly repeatability of the ColorQ tells me that the 0.01 ppm resolution of its Cl/Br test is probably not justified and gives a false sense of accuracy. But I don't have a fancy lab anymore and can't be sure.
I'd appreciate comments from those of you with more pool testing experience/expertise. Thanks.