Brand new 7 in1 aquarium test kit. 50 sheet in total. 3 steps to test the water. 1. Dip the test paper into water for 2 second 2. Put it horizontally for 60s in your hand. 3. Compare the color to check water quality. Test kit can check ph, no2, no3, gh, kh, free chlorine and cl2. Test kit is essential stuff as it’s important to know the water condition in the tank so that we can prevent fish or plants getting sick or die.