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Amazon.com: AERO-GRO Digital 4-in-1 Water Quality Testing Kit - High Accuracy Digital pH/TDS/EC/Temp Pen Set Perfect for Hydroponics, Pools, Koi Ponds, Drinking Water, Wine/Beer Making, Hot Tub, Spa, Aquarium : Patio, Lawn
Portable TDS Meter
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TDS-1392 0~1999 PPm (mg/L) Range Digital TDS Meter + Monitor + Power A – Gain Express
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