build ATC sensor, economic type PEN pH METER Model : PH-223 * 0 to 14.00 pH. * ATC (auto temperature compensation). * Auto calibration for pH 4, pH 7 or pH 10. * Meter with pH electrode, all in one. * IP-67, water proof. * Easy replacement for the pH electrode. * Pen type, easy operation carry out. * pH 4, pH 7 standard solution are included. * DC 1.5V battery (UM-4, AA) x 4, long life. * Pen type easy carryout.
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