The ideal litmus test strip for classroom
These pH test strips provide a distinct colour for each pH unit from 1,  3, 5, 6, 7, 8, 9, 10, 12, and 14.
Economically priced, this litmus paper is ideal for use in pH experiments where a wide range of acids and bases is involved.
Each vial contains 5 books of 20 strips. Each strip measures 5mm x 45mm. Includes colour comparison label.