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Portable pH / EC / TDS / Temperature Meter - HI9812-51
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pH Meter and TDS, EC, Temperature Meter (Accuracy: pH: ±0.1, TDS: ±2-5 – LabRat Supplies
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Cubilan PH Meter, TDS PPM Meter, Soil PH Tester, PH/EC Digital Kit, 3 Pack B08S2YS52F - The Home Depot
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HANNA® GroLine Hydroponic Waterproof pH/EC/TDS/Temperature – GARDEN SUPPLY GUYS
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