time for new test kits

[danny zubot]

Please back up your statements.
For Mg test anyway, Elos Mg test is a PITA to do because you have to do almost the same thing twice and then do some math.
Please point me to a reference where it states Salifert is the most accurate for Ca, Mg and KH.

I agree with the Mg test, PITA! But still easier to use than Salifert IMO.

I stated that Salifert was the most accurate because of the incriments of measure compared to the other tests. I don't use salifert because I don't care to know if my CA is 423 ppm or 429 ppm for example. I use API because for me anyway; it's good enough that it is between 400-420 ppm.