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Instructions: 1. Take one strip from the pack and dip it into the solution you want to measure, the color of your strip will change immediately. 2. Quickly compare this color to the color chart on the inside of your pack to obtain the pH, do not wait or let the strip dry. 3. The number next to the color on the chart is your pH, pH 1-14 color chart in each pack. Note: Please allow a little error on the size due to manual measurement. This paper does not apply to buffer solutions and very weak acid-base solution concentration lower than 0.01%. The paper need to be stored in the dark and dry place.