Product features: Full pH range: the pH test strip has full pH range, measures pH values in the range of 0 to 14, pH color chart intervals: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, easy to read Scroll design: compact and lightweight reel design for convenient use and carry; Each roll length approx. 16.4 ft/ 5 m Material: pH paper is made of quality litmus paper, extremely accurate and reliable, quick response in just seconds Easy to apply: remove a small test strip, ust soak a test strip in the test solution for a half second and compare it with the standard color on the card board, then the result is obtained Wide applications: universal pH paper is great for Science Education also can be applied to detect the pH of body urine, saliva, drinking water, swimming pools, fish tank, hydroponics, aquariums, food, etc. Package includes: 1 X PH test strips