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HM Digital COM-80 Electrical Conductivity (EC) and Total Dissolved Solids Hydro Tester, 0-5000 ppm TDS Range, 1 ppm Resolution, 2% Readout Accuracy: Tds Meter: Amazon.com: Industrial & Scientific
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Hm Com-80/100/200/300/360 Digital Orp Ph Tds Meter Temperature Tester Waterproof With Automatic Calibration Portable Tester - Ph Meters - AliExpress
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