"This item is a life saver of sorts. The API test vials are a small diameter and are hard to stand up, especially with old shaky hands. This item makes water testing easy. Put needed number of vials in the holder and fill with aquarium water to the 5 ml mark using a syringe. Take out one vial at a time and apply requsit number of test fluid drops, cap, shake and return to holder. No more concern that a vial falls over. After testing, empty vial and rinse out. Dry and place vial upside down in the holder to fully dry. Since I use glass vials rather than the plastic ones I store the cap on the bottom end of the vial. Store vials in holder until next test. Very nice item and it looks sturdy. Been using for only a few days now but it has made my daily new aquarium cycling testing easy and quick. Thanks!!"
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