Features: There is a strong correlation between the pH of the body's internal environment and pH paper. Testing many usual everyday substances, including moisturized soap, lemon juice, milk, liquid detergent, moisturized soil, saliva, urine, sweat...etc.
Use: Immerse a small tester paper into liquid sample for a second, waiting for seconds, then comparing paper color with chart color: 1-3 indicates "Very high acidic". 4-6 indicates "Acidic substance". 7 indicates "Neutral". 8-11 indicates "Alkaline". 12-14 indicates "Very high level of Alkalinity".