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Amazon.com: Milwaukee BEM802 Combination pH/EC/TDS Meter with 110V Power and Mounting Kit, 0.00 to 14.00 pH, +/-0.20 pH Accuracy : Industrial & Scientific
Milwaukee EC-Meter CD611, 34,90 €
Milwaukee EC59 Martini Pocket Conductivity Meter - Hogentogler.com
Milwaukee EC60 PRO Waterproof 3-in-1 Conductivity / TDS Tester with Thermometer and Replaceable Probe