Bluelab TRUNCOMV2 Commercial Truncheon Nutrient Meter with Increased Measurement Range, Digital Conductivity (TDS, EC, ppm 500, ppm 700, CF) Tester in Water, Tool for Hydroponic System and Plant Grow

WLR Industries HANNA HI9813-6N Waterproof pH/EC/TDS Meter Probe

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

Apera Instruments PCO60-Z Bluetooth pH/Conductivity/ORP/Redox/TDS/Salinity/Resistivity Smart Multi-Parameter Meter Tester Kit Powered by ZenTest Mobile App with Cloud-Based Datalogger

Bluelab Combo Meter for pH, Temperature & Conductivity in Water - Easy Calibration, Digital EC/TDS/PPM Tester for Hydroponics & Indoor Plants (METCOM)

HORIBA U-52 (6 ft /2m Cable) Multiparameter Water Quality Meter pH/ORP/Dissolved Oxygen/Conductivity/Salinity/TDS/Seawater Gravity/Temp/Turbidity

in-Line TDS Meter Digital Water Tester, Accurate and Reliable Small Water Quality Monitor Ideal for Drinking Water, Hydroponics, TDS and PPM Measurement

Bluelab METCOMPLUS Combo Meter Plus for pH, Temperature, and Conductivity in Water and Soil with Easy Calibration, Digital Nutrient (TDS/PPM) Testing Kit for Hydroponic System & Growing Indoor Plants

Apera Instruments SX751 pH/ORP/DO/Conductivity/TDS/Salinity/Resistivity/Portable Handheld Multiparameter Meter Kit, Silver

KALWNIA 2025 New 4-in-1 TDS Meter Digital Water Tester – 0-9990 ppm, EC, Temp (°C/°F), ATC, Backlit LCD for Drinking Water, Aquariums, Hydroponics, Pools, Portable with Case