<p>Multiple uses: Can be used in school, laboratory, drinking water, swimming pool, aquarium, food, etc. Note: If you want to test your saliva, please test 2hours after eating or drinking without rinsing the mouth. Function: Good for testing the body's acidic alkaline pH level and finding a way to maintain a balanced diet. Contents: 2 boxes of pH test strips </p>Universal Applicability: PH test strips help keep your body healthy and can be used to test lemon juice, milk, soap and detergent, etc. Acid-base test strips Universally suitable for swimming pool water, cosmetics, school lessons and laboratories, etc. Quick results: Put litmus paper in the liquid.Read the result after about 15 seconds and compare it with the pH color chart. Test range: swimming pool ph strip scales from 1 to 14: 1 - 3 is very acidic, 4 - 6 is acidic, 7 is neutral, 8 - 11 is alkaline, 12 - 14 is very alkaline. Function: Good for testing body acid alkaline pH level and finding a way to maintain a balanced diet.