It is far more likely to freak you out with a bad reading one day than to actually save you any grief from an actual problem.
This is not true. I dose kalk and two part. The first, and only indication of a problem with dosing is when the ph changes. I can verify the dosing of kalk and two part with the momentary spike in pH.
When I upgraded tanks, I screwed up the kalk dosing code and the only thing preventing a complete crash was the pH shutoff.
I've been running this for two years now and have never had a "bad reading". It fluctuates fine, but never a crisis.
plus why dose kalk and 2 part, thought it was one or the other