My test kit has a high ph and a low ph.
I test my water with lowtest and get a blue color which corresponds to a 7.6, which is the limit of the test. I test my water with hightest and get a brown, -similar to 7.8. -the lower limit of this test.
For those of you have these kits, which do you follow, and which is most likely the true ph? With these 2 values, it's hard to predict an accurate CO2