First why don’t you continue to elaborate on how ghl’s .1 accuracy claim is rounded down from .2? You have been incredibly rude telling me to go read about significant digits, precision vs accuracy, and all the while you’re completely wrong.LoL - I don't want to control anything. I was asking you in the context that you must have precision pH readings.
WHY do you need them (1 tenth accurate readings +/- 0) if you don't have a means or plan to act upon them? This entire thread is a circular conversation based on your need to have precise pH measurements for $1200 an inch coral because that coral grows best at some xxxx perfect pH.
Sorry, but none of this makes sense and instead it goes back to chasing an unimportant level of precision with a non precision instrument. I think we are here because you assumed that one or more of these devices was more precise than it is, not because it matters, but because it bothers you.
Asking again, why do you need to READ pH to 1 tenth of a unit of precision???
Second we have already established a difference in .2 ph is a 58% difference. If you don’t care about 58% then move on, others do.
Third I don’t care that my ph is at this magical level you speak of. I have said it once I’ll say it again, I want high ph. That can mean 8.2 in the am and 8.4 in the pm or 8.3 all day long. You are the only one bringing up this thought of it staying at a certain level. Although it can be done btw using an apex and a solenoid valve on a co2 scrubber, but I don’t have a magical number other than aim for natural seawater.
And my whole point here is that I have reason to believe one of my probes is off by more. So I want to figure out if I am at ph of 8.3 or 8.0. Which is the difference of where I want to be versus not even close.
And lastly you are the one obsessed with arguing with me on all this in an attempt to derail this thread. Good job mission accomplished.