With the Quick Test 6in1, sera offers the optimal possibility to check the most important water values (pH value, carbonate hardness, total hardness, nitrate, nitrite and chlorine) in the aquarium quickly and easily with only one test strip.Use of Sera Quick Test 6in1Hold a test strip in your tank for one second, then wait 1 minute and compare the intensity of its discoloration with the scale on the package. A safe procedure that helps even newcomers to achieve the best possible water qualities in their aquariums. Pack contains 50 test strips.