strange pH results

[waterbear]

I would test both your pH reagents with the acid and base demand reagents in the K-2006 to see how quickly the color changes.. It is not unusual for phenol red to go bad. How old are the reagents? I have had them go bad after one or two seasons and when they do they read around 7.8 or 8.0 no matter what the pH is. Also, is there any contamination in the comparator of the k-2006? You might want to clean it well, rinse it with pool water and then retest.

I would test again and take a sample to the pool store and see what they come up with.I suspect it will confirm one test or the other. For the one that is "off" get new reagent and clean the comparator well.

I suspect that your R-0014 in the K-1000 kit is newer than the R-0004 in the K-2006 and is the one to be trusted.

Also, since the K-2006 uses the same comparator for the CH and pH (and TA) tests and the CH test is done at a high pH cross contamination could also be the cause.