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EC TDS Meter and PH Meter 2pc Combo TDS EC Meter Electrical Conductivity Water Purity Tester Water Filter Quality Measuring Machine Portable Pocket Handheld Pen Type PH Tester Liquid PH Alkalinity Value Hydrotester for Hydroponic, Liquid, Purity, Acidity, Alkalinity, PPM Indicator for RO UV UF Mineral Water Purifiers Filter Service Digital TDS Meter