I bought these hoping they would help me keep track of my water. The readings were crazy, did it 3 times. I took a water sample to a local fish shop and they did a full panel reading for me while I waited 45 minutes. These strips said the pH of my water was above 7.0 when in fact it was below 5.0. That's a huge difference. All other readings were also inaccurate and very, very far from the truth. Worse, I ran a few more tests with these strips over the next two weeks just to see and each time I took them I found they gave the exact same readings twice with a slight change in the nitrite level delivered. From more than ten readings. Every single reading was the same but not for the fish shop readings which have changed (PH issues are now fixed). So, based on my experience with these strips, I have to say that I sincerely believe they are flawed and I would not recommend them to anyone.
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