Nitrate Test Kit.
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Nitrate is toxic to fish at high levels and is extremely toxic to some invertebrates even at low levels, so specific tolerance levels need to be determined. Nitrate is also a major cause of algae in freshwater aquaria and a nitrate test can determine when a water change could help.
Aquasonics Nitrate test kit measures the nitrate ion and not the nitrate nitrogen as some kits do, so it is easy to apply the recommendations of most books.
The test kit is accurate and as with all Aquasonic test kits, all the reagents are available, so you only replace the reagent you need.