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In general API test kits get a really bad rap.. They from my experience are just as reliable as any test kit.. They just may not have as precise of scale/graduations..
Most though will recommend Red sea or Salifert..
The Hanna checkers are usually very nice too.. (some debate about their accuracy from some but in general they seem reliable)
I've always used Red Sea or API and recently tried Nyos and Salifert for nitrate.. To me Nyos was hands down easier to read vs the Salifert kit..
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