Draw 4 ml of tank water in the fat srynge then drop into test vial...Add 2 drops of the little blue bottle to test vial....then take the little plastic tip and put on skinny srynge and draw 1 ml of fluid from the larger bottle that came with test kit..add 1-2 drops at a time to test vial and swirl after each 1-2 drops until the colour changes to pink......tip skinny srynge to where it is pointing up, take your reading, then compare to chart that came with kit
HTH