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The test strip color changes must be matched with the pH scale color chart within about 15 seconds There is a strong correlation between the pH of the body's internal environment and pH paper help you to maintain good healthy body by testing many usual everyday substances, including moisturized soap, lemon juice, milk, liquid detergent, moisturized soil, saliva, urine, sweat PH 1-14 color chart in each pack Strip Length 5 meter