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Reand 1666
pH test paper Duotest pH 1–12, with two indicator zones
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Reand 1771
pH test paper Duotest pH 1.0–4.3, with two indicator zones
Reand 1587
pH test paper Duotest pH 3.5–6.8, with two indicator zones
Reand 1549
pH test paper Duotest pH 5.0–8.0, with two indicator zones
Reand 1629
pH test paper Duotest pH 7.0–10.0, with two indicator zones
Reand 1695
pH test paper Duotest pH 9.5–14.0, with two indicator zones