API nitrate test difference
I recently bought another API nitrate test because I had questions whether or not the one from my all in one kit was still reading good. Well I tested the same water with both tests and they came out exactly the same, but one difference was the cards color was a bit different. So reading form my multitest card my nitrates are at 40ppm but only 20ppm on the 1 test card. Which one do you guys think is correct?
Comparing it to mine the one on the right looks correct to me. The one on the left might be for saltwater?
The one on the right is the one i'd go by. It looks the same as what I use.
Alright thanx, I will confirm that it is a freshwater card, so maybe that card was printed bad.
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