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The color chart makes it really easy to read the results, and the included test tubes fit perfectly in my small cabinet. Finally getting precise iron readings has helped me adjust my dosing routine without guessing.

I was a little worried about overdosing iron supplement, but the color chart in this drop test is super easy to read. The included test tubes and printed guide made my first check take under five minutes.

Finally a test that gives me clear iron readings in the range I actually need for my high-tech planted setup. The visual instructions on the bottle made the whole drop test process a breeze, and the included test tubes are a nice bonus.