Ph Strips: There is a strong correlation between the pH of the body's internal environment and pH paper helps you to maintain a good healthy body by testing many usual everyday substances, including moisturized soap, lemon juice, milk, liquid detergent, moisturized soil, saliva, urine, sweat...etc. Multiple Uses: • Testing the pH of body saliva and urine to check your health • Check your pet dog's body acid-base • Testing your hydroponic plant growth environment • Do some science experiments with your children about acids and bases to rich scientific knowledge • Also apply to testing household items, drinking water, swimming pools, fish tank, aquariums,food, etc.