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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...etc. Work: Different pH content discoloration range is different, by comparing the color card ratio: the smaller the number, the stronger the acidity, the larger the value, the stronger the alkalinity. PH Test Paper: pH test paper can be commonly used to test many commonly used substances, including urine, sweat, moisturizing soap, lemon juice, milk, liquid detergent, moist soil, and so on. How to Use: According to the acidity of the object to test its PH value. To read the PH value by matching with the PH scale color within around 15 seconds. They are perfectly used for a classroom or youngsters doing experiments and working with acids and bases. 2- Common Uses and Examples of pH: Acid Rain, pH = 4.3 - 5.6; Ammonia Based Glass Cleaner, pH = 10; Battery Acid, pH = 1; Beer, pH = 4.5; Bleach, pH = 12.6; Drain Cleaner, pH = 14; Drinking Water, pH = 6.5 - 8.5; Fruit Juice, pH = 2 - 5.5; Gastric Acid, pH = 1.5 - 3.5; Lemon Juice, pH = 2; Milk, pH = 6.8 Instruction: Simply dip the testing strip in the liquid you are testing. Half second later, take out the paper and using the color chart included, compare the color change of the paper to find out the acidity level of your testing subject. Cannot indicate the Acid or alkali solution when its density was lower than 0.01%. Keep dry for the rest paper