pH 1-14 universal indicator papers for alkaline / acid tests With a pH color chart on each pack Test Range: pH 1-14 Test paper amount: 80 strips per pack Material: Paper Instructions: Ensure the solution to be tested is safe before use. Dip the strip into the solution for half a second, then remove and compare with the color chart to determine the pH value. 1 - 3 indicates a very acidic substance 4 - 6 indicates an acidic substance 7 indicates neutral 8 - 11 indicates alkalinity 12 - 14 indicates a very high level of alkalinity Size: approx. 7 x 0.4 x 4.5 cm / 2.76 x 0.16 x 1.77 inch Package Includes: 1 Pack pH Indicator Paper (80 Strips) (5 Pack) Note: These test papers are intended for general testing purposes and are not designed for precise or laboratory-grade measurements.