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Milwaukee Instruments MW801 Standard Portable pH/Conductivity/Tds Combination Meter, 0 Degree C to 50 Degree C Temperature Range, 0.1 pH Resolution: Science Lab Multiparameter Meters: Amazon.com: Industrial & Scientific
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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
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