Uxcell pH1 to pH14 Test Strips 720 Litmus Indicator Paper Alkaline Acid Testing, 9 Pack

Litmus papers are used to determine the pH level of a liquid and determine if a solution is acidic(Red), basic(Blue), or neutral. Widely used for industrial chemical testing, science education, laboratory use, drinking water, swimming pool, spas, aquariums,s and classroom analytical chemistry.

Advantage
There are 14 color-coded scales that go from 1(being the most acidic) to 14(being the most alkaline). Also can be used to determine the strength of acid and base, as we go from 7 to 1 the acidity of the solution increases.

Instruction
Dipping 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. The smaller the pH value, the stronger the acidity, the higher the pH value, the stronger the alkalinity, when the pH value is 7, the solution is neutral.

NOTE
The test strip itself is yellow, the corresponding pH is 6(weak acidity), and it will not change color (or change very little) if the pH of the tested liquid is 6. Not applicable for oil and acid-base solutions with a concentration of less than 0.01%. Should be stored in a dry place protected from light.