I have (by last count) a dozen aquariums. To ensure good water quality for my fin friends, I test several different water values with test drops every week. I took these test tubes and a test tube to make working with all the water sample tubes easier and it made that job a lot easier. whenever I dropped one while washing afterwards. These tubes are much stronger and I haven't broken any yet, although I often drop one or more in the sink when washing them.
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