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Reand 1662
pH test paper Duotest pH 1–12, with two indicator zones
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Reand 1767
pH test paper Duotest pH 1.0–4.3, with two indicator zones
Reand 1583
pH test paper Duotest pH 3.5–6.8, with two indicator zones
Reand 1545
pH test paper Duotest pH 5.0–8.0, with two indicator zones
Reand 1625
pH test paper Duotest pH 7.0–10.0, with two indicator zones
Reand 1691
pH test paper Duotest pH 9.5–14.0, with two indicator zones