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This pH level test strips are designed specifically for measuring the pH level of liquid. 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. Remove a small test strip, touch the liquid to be tested, a few seconds later, compare the test results with the standard color on the card board. Suitable for both labs and at home to measure and inspect water quality, urine, saliva, soil, alkaline diet, aquariums etc. pH paper is good teaching supply for schools, lab, also can be applied to detect fish tank, hydroponics, aquariums, industrial testing, agricultural testing, etc.