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Real sample test images of (a) Vinegar solution; (b) the antacid plus; (c) Malta, (PANI-CFC working electrode and Ag/AgCl reference electrode); (d) OCP measurement of Malta, vinegar, and the antacid plus (conditions: PANI-CFC working electrode, platinum wire counter electrode, and Ag/AgCl reference electrode; 20 mL of each sample was taken for the measurement); and (e) Column representation of the comparison between PANI-CFC sensor and commercial pH meter.
