Or careless take your pick. I dropped one of the test tubes for the API water testing kits and it shattered. If I use one and then rinse it thoroughly is it ok to use it for 2 different tests? Like pH and ammonia or nitrite and nitrate?
The API kit I first had in the 1990's had six tests and 4 tubes that were intended for multiple tests. Just rinse it thoroughly immediately after each test.
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