pH-indicator paper Litmus paper blue Roll (4.

Traditional pH indicator test papers, supplied on a 4,8 metre roll, consisting of high quality filter paper impregnated with indicator and mixed indicator solutions then dried and cut to size. Roll format are easy to use and most common ranges are available in a refill format Quality assurance - tests are checked and calibrated against certified buffer solutions Wide and narrow pH ranges available * no colour scale card supplied ** pack of 3×100 strips