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Reand 1664
pH test paper Duotest pH 1–12, with two indicator zones
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Reand 1769
pH test paper Duotest pH 1.0–4.3, with two indicator zones
Reand 1585
pH test paper Duotest pH 3.5–6.8, with two indicator zones
Reand 1547
pH test paper Duotest pH 5.0–8.0, with two indicator zones
Reand 1627
pH test paper Duotest pH 7.0–10.0, with two indicator zones
Reand 1693
pH test paper Duotest pH 9.5–14.0, with two indicator zones