I used the pH test kit that came with my TF-100 and get a reading of 7.2.
I thought this was very low considering the pool company tested the water at 7.8.
I then used the Pentair test kit that came with the pool and it tested at 7.6.
(All tests have been conducted a couple of times with the same results.)
What could cause the difference between the TF-100 and the Pentair kits? I am inclined the believe the Pentair as it is closest to the pool company