Elos. After hearing about all the issues with the Salifert kits I went with Elos . Dosent have the resolution of a Salifert, ie it goes up by 1's 1, 2, 3, 4, 5 but that is good enough .
Only 1 chemical to play with and it comes in a medical grade dropper which works very nicely
Also now using an Elos Mg kit and like it as well
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-captainhemo
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