Hi,
I also find the ELOS Mg a PITA, the previous version was much easier to use…I now use Tropic Marin for Mg.
NO3, LaMotte, easy to use and results are very consistent.
dKh, ELOS, again very easy to use and consistent.
Ca, LaMotte easy and consistent.
Potassium (K+), Korallenzucht(Zeovit), takes time to get accustomed to.
PO4, DD and a Hana photometer.
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