Duotest and Tritest

pH papers with multiple indicator zones

By the combination of several indicators on one test paper, a better recognition between different pH values is achieved. This makes the correct pH reading easier.

Duotest – two indicator zones for higher accuracy

Duotest indicator papers combine two different indicator zones on a single strip. The zones are separated by a hydrophobic barrier, which effectively prevents mixing of the reaction colors and increases the mechanical stability.
Tritest – three indicator zones for highest precision

Tritest indicator paper has three different indicator zones on a single paper. The three zones guarantee optimal color differences and safe determination of in‑between values. Tritest indicator paper is available for a pH range from 1 – 11 and feature 1 pH unit increments.

In Tritest L indicator paper, two hydrophobic barriers separate the indicator zones. Even in strongly alkaline solutions, the colors of the zones do not mix.

More Refills (box of 3 rolls) available - Please inquire for more information.

Our Duotest and Tritest Products

DUOTEST pH 1-12 Dispenser

REF: 90301

Duotest indicator papers combine two different indicator zones on a single strip. Gradation: pH 1 · 2 · 3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 · 12

$19.95

DUOTEST pH 1.0-4.3 Dispenser

REF: 90302

Duotest indicator papers combine two different indicator zones on a single strip. Gradation: pH 1.0 · 1.3 · 1.6 · 1.9 · 2.2 · 2.5 · 2.8 · 3.1 · 3.4 · 3.7 · 4.0 · 4.3

$19.95

DUOTEST pH 3.5-6.8 Dispenser

REF: 90303

Duotest indicator papers combine two different indicator zones on a single strip. Gradation: pH 3.5 · 3.8 · 4.1 · 4.4 · 4.7 · 5.0 · 5.3 · 5.6 · 5.9 · 6.2 · 6.5 · 6.8

$19.95

DUOTEST pH 5.0-8.0 Dispenser

REF: 90304

Duotest indicator papers combine two different indicator zones on a single strip. Gradation: pH 5.0 · 5.3 · 5.6 · 5.9 · 6.2 · 6.5 · 6.8 · 7.1 · 7.4 · 7.7 · 8.0

$19.95

DUOTEST pH 7.0-10.0 Dispenser

REF: 90305

Duotest indicator papers combine two different indicator zones on a single strip. Gradation: pH 7.0 · 7.3 · 7.6 · 7.9 · 8.2 · 8.5 · 8.8 · 9.1 · 9.4 · 9.7 · 10.0

$19.95

DUOTEST pH 9.5-14.0 Dispenser

REF: 90306

Duotest indicator papers combine two different indicator zones on a single strip. Gradation: pH 9.5 · 10.0 · 10.5 · 11.0 · 11.5 · 12.0 · 12.5 · 13.0 · 13.5 · 14.0

$19.95