I have the same problem between my alk kits. I use salifert elos and hanna, 10 out of 10 times they will yield different results. I use the hanna kit now for a reference point, but I have a multi color acro that goes pale as soon as some thing is wrong, which most of time means alk drop. I tend to rely on observing my corals more than my test kits. Just my 2 pennies.
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