I couldn't find a more recent post about strip accuracy. So, I am bumping an old post. Sorry.
Split to a new topic. Please ask questions in your own topic, instead of reusing someone else's exsiting topic. JasonLion
I am doing "research" for my company on pool testing equipment. We supply dehumidifiers for indoor pools (mostly commercial). I understand that you guys are more experienced from a residential side but pool testing is essentially the same.
Anyway, according to PA state code, pool owners are required to test their pools atleast twice per day and set limits on the accuracy of acceptable tests to use. Residual (chlorine) to be accurate within 0.1ppm and pH to be accurate within 0.2 pH units.
From what I've read on this site, there is a lot of distrust in the strips. However, from what I've read (mostly from the sellers themselves), there's been advancements to make strips more accurate including handheld digital strip readers. There are now even iphone apps that will display readings of the sticks (e.g. howsmywater) from taking photos of the strip. In reference to accuracy, Aquachek makes claims that they are just as accurate as liquid tests and perhaps have even greater accuracy due to the simplicity of "dipping" and reading. I am widely skeptical that this is just propaganda.
Does anyone have more recent experience with strips, digital strip readers, or the apps and how they stack up with your tfp FAS-DPD tests? Any info would be helpful.