sera Quick Test Quick and easy monitoring Routine monitoring or safety check: The sera Quick Test provides the optimal possibility to check the most important water parameters (pH value, carbonate hardness, total hardness, nitrate, nitrite and chlorine) in the aquarium with just one test strip quickly and without any problems. Immerse a test strip in your tank for a second, then wait for 1 minute and compare the intensity of its colors to the chart on the package. A safe procedure that also supports beginners achieve best possible water quality in their aquariums. In case the measurement reveals deviations from the optimal levels, the sera liquid tests allow determining the differences exactly.