I understand the cond. probe IS accurate when calibrated properly. I also understand the cond. probe is measuring salt only (not all the other components in aquarium water like magnesium etc.)
Last, I understand refraction meters measure specific gravity. Two different measurements and two different ppt readings.
What I don’t understand is when (assuming all instruments are properly calibrated) the probe reads 31.3ppt and the refractor reads 1.025.
If the true salt content (salt only) should be 35ppt then salt should be added. (Using ocean levels as the bar)
For years the refractor reading is used to adjust.
What reading should I monitor and adjust? Refractor or probe?
I know consistency is the key, but I wish to maintain what is the very best for the fish and corals.
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