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HoneForest Water Quality Tester, Accurate and Reliable, TDS Meter, EC Meter & Temperature Meter 3 in 1, 0-9990ppm, Ideal Water Test Meter for Drinking Water, Aquariums, etc. from $13.96	VIVOSUN Digital pH and TDS Meter Kits, 0.01pH High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Household Drinking, and Aquarium, UL Certified from $13.29 ($13.29 / 100 g)
2024 Upgraded TDS Meter Digital Water Tester, DUMSAMKER Professional 3-in-1 TDS, Temperature and EC Meter with Carrying Case, 0-9999ppm, Ideal ppm Meter for Drinking Water, Aquariums and More from $13.96	Hofun TDS Meter, 3 in 1 TDS, EC & Temperature Meter, Accurate & Reliable PPM Meter, Digital Water Testing kits for Drinking Water Quality, Tap, Well, Swimming Pool, Aquarium, RO/DI System, Hydroponics from $9.99
Bluelab PENCON Conductivity Pen and Digital TDS Meter, Water Tester for Temperature and Nutrient (CF, EC, PPM 500, PPM 700), TDS Testing Kit for Hydroponic System and Indoor Plant Grow $88.62 from $76.43	2024 Newest TDS Meter Digital Water Tester, Lxuemlu Professional 3-in-1 TDS, Temperature and EC Meter with Carrying Case, 0-9999ppm, Ideal ppm Meter for Drinking Water, Aquariums and More from $9.97
PH Meter, TDS PPM Meter, Soil PH Tester, PH/EC Digital Kit, 3 Pack from $21.99	HM Digital COM-80 Electrical Conductivity (EC) and Total Dissolved Solids Hydro Tester, 0-5000 ppm TDS Range, 1 ppm Resolution, 2% Readout Accuracy $26.00 from $25.99
Craft911 SAFEWATR™ TDS Meter Digital Water Tester - 3 in 1 Accurate Fast TDS, EC, PPM Meter 0-9990 \| Water Quality Tester - TDS Water Tester for Drinking, Hydroponics, Aquarium from $11.99	YINMIK EC PPM pH Monitor for Hydroponics Nutrients, WiFi pH PPM Tester for Plant Growers, Continuous Monitoring pH PPM EC Temp. of Indoor DWC Growing System, Hydro Reservoir Tank, Aeroponic Garden from $79.99