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How to use Test pH Wash the glass bottle several times with the water sample to be examined, then fill the bottle with 5ml of water sample. Dry the outside of the bottle. Shake the reagent bottle well before use. Put 4 drops of reagent in a glass bottle containing the water sample to be examined, close the lid of the bottle, gently shake and open the lid. Compare the test results with the color comparison chart: place the glass jar in the white area of the color chart, compare the test results with the color chart and see the corresponding pH value. Clean inside and outside the glass jar with tap water before and after each test.