These papers are impregnated indicator papers with greater accuracy and improved ease of reading. Two complimentary indicator zones on one strip – separated by a white centre band – guarantee clear colour diffentiation and a more accurate estimation of intermediate pH values. The white centre band is hydrophobic and prevents that colours of the two indicator zones run into one another.

	Duotest 1 – 12 Range: 1–2–3–4–5–6–7–8–9–10–11–12 pH Reel of 5 m x 7 mm ... $25.80 + GST
	Duotest 3.5 – 6.8 Range: 3.5–3.8–4.1–4.4–4.7–5.0–5.3–5.6–5.9–6.2–6.5–6.8 pH Reel of 5 m x 7 mm ... $25.80 + GST
	Duotest 5.0 – 8.0 Range: 5.0–5.3–5.6–5.9–6.2–6.5–6.8–7.1–7.4–7.7–8.0 pH Reel of 5 m x 7 mm ... $25.80 + GST
	Duotest 9.5 – 14.0 Range: 9.5–10.0–10.5–11.0–11.5–12.0–12.5–13.0–13.5–14.0 pH Reel of 5 m x 7 mm ... $25.80 + GST