I thought this would be an easy way to test the water in my tank as I am new to the hobby. I didn't want to go out for a full set of APIs! The instruction manual was pretty basic, so I'll rate it for that. It just wasn't read. They barely changed when I tested water with them and they overlapped like crazy making reading even more difficult! That was not the case on the new tank that I drive now. These strips didn't catch anything. I do not recommend.
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