Check the listing for details. pH0-14 Test Strip 100 Litmus Indicator Paper Tester Alkaline Acid Testing. Condition: New. Listed at 13.47 USD. Litmus papers are used to determine the pH level of a liquid and determine if a solution is acidic, basic, or neutral. Widely used for industrial chemical testing, science education, laboratory use, drinking water, aquariums, and classroom analytical chemistry.SpecificationAccuracy: 1 pHTesting Range: 0-14Testing Paper Size: 72mmx6mm (L*W)Overall Size: 85mmx63mmx10mm (L*W*H)Packing List: 1 x Litmus Test Kit (100/Pack)Advantage100 pre-cut long strips are sealed well with 1 individual plastic package case to preventing from being damaged, convenient to use. Very sensitive to the environment and temperature changes.InstructionDipping the pH paper into a solution and observing the change in color of the paper. After one second, compare it with the standard color cards and read the pH value.