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Hanna Instruments HI98304 DIST4 EC and TDS Tester, 19.99 mS/cm, 0.01 mS/cm Resolution, +/-2% Accuracy: Science Lab Conductivity Meters: Amazon.com: Industrial & Scientific
HI98312 Hanna Instruments | Hanna Instruments HI98312 Water Conductivity Meter | 434-2386 | RS Components
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