General description The Universal pH Test Strips are designed for accurate pH measurement across a full range of 0 to 14. Made from quality litmus paper, these strips provide fast results in just seconds. They are suitable for various applications including educational purposes, laboratory testing, aquariums, hydroponics, and agricultural testing. Technical specifications pH range: 0-14 Roll length: 16.4 feet (5 meters) per roll Total length: 32.8 feet (4 rolls) Usage To use the pH test strips, simply take out a small strip, touch it to the liquid you wish to test, and after a few seconds, compare the resulting color with the standard color chart provided on the packaging.