well your implying that the saifert one requires you to squint at a chart. the salifert alk test kits doesn’t have a colour chart, you just add agent untill the mixture changes colour, i thought you were confused. how could that ever happan.
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For alk I use hagen because you just add drops until the colour changes. You don't have to squint at a colour chart with that one.
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hagen test kit's are pretty notoriously inaccurate my point is that given their inaccuracy if the only way your testing your tanks alk is with a hagen kit then you don't have an accurate measure of your alk.
if you don' like the way people type their comments out then i suggest you stay with books and magazines.