Double-Zone pH Test Papers

Duotest pH papers are characterized by their high accuracy and easy readability. Two corresponding indicator zones allow the detection of even the slightest colour differences and the accurate estimation of intermediate values. Gradations are 1.0 pH for 1.0 to 12.0 pH range and 0.3 to 0.5 for the rest. Rolls are 5 m long and 10 mm wide.