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Portable Waterproof pH/EC/TDS Low Range Meter (0 to 3999 µS/cm, 0 to 2000 ppm) - HI991300
Digital pH Meter PPM,TDS&EC Water Quality Tester,±0.01pH for Home Lab WHOLE SALE | eBay
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Membrane Solutions pH and TDS Meter for Water, 0.05ph High Accuracy ±2% Readout Accuracy for Hydroponics, Household Drinking, and Aquarium, UL Certified - Walmart.com
HANNA® GroLine Hydroponic Waterproof pH/EC/TDS/Temperature – GARDEN SUPPLY GUYS
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AQUAMASTER P700 PRO 2 - Growrilla Hydroponics
24-7 Nutrient Monitor by CWP Instruments
PH Meter, TDS PPM Meter, Soil PH Tester, PH/EC Digital Kit, 3 Pack - Walmart.com
GroLine Waterproof Portable Hydroponics pH/EC/TDS Meter - Aggressive Garden
