High nitrite levels are toxic to fish and shrimp and it's essential that you know your levels before introducing ANY livestock. It also allows you to understand your filter maturity as when your filter is still cycling, you will have levels of nitrite. Careful and daily monitoring means you fully understand what is happening to your water and when it's safe to add any livestock or IF you need to do a water change.
The Colombo Aqua NO2 Test Kit comes complete with a colour chart, Nitrite solution, measuring tube and manual making it straight forward and simple to use. Results are precise too.
40 tests on this kit.