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Digital PH Water Quality Monitor For Swimming Pools ph water tester Ph meter AH-3020 digital type with the batteries high quanlity Quick Detail: 1) test PH value; 2) LCD display; 3) accuracy +/-0.02 4) easy operation and take away 5) Measuring range pH: (0.00~14.00)pHmV: (-1800~1800)mV Description: * 0.00 to 14.00 pH. * Pen type digital pH meter, all in one, pH electrode included, easy to use. * Water proof. * Provided with pH 4.01, pH 7.00, pH 10.01 buffer. * Easy to change