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Title: Works and is easy to use
Review: You drop a fixed number of drops into a fixed amount of water, as measured in the enclosed test tube up to the given line. The number of drops to use is listed right on the bottle. After a few minutes, you compare the color of the water to the color chart on a card, which gives you your nitrite level. It's plenty easy and effective.It could be even easier if the chart was on the bottle (no need for that extra card lying around), or if there was a test where you just stuck a gauge in some water and got the value, but I've never seen anything like that that doesn't expire at some point.
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