Apera Instruments PC910 Benchtop Dual-Channel Ph/Conductivity Meter Kit With Labsen 211 Refillable Glass Ph Electrode

APERA INSTRUMENTS AI316 Premium Series PC60 5-In-1 Waterproof Ph/EC (Conductivity) /TDS (Ppm) /Salinity (Ppt) /Temp. Multi-Parameter Pocket Tester Kit

Extech 0 To 14 Ph, Ph/Conductivity Meter Conductivity Probe, Accurate Up To 2% Ec500 - 88636949

Bluelab Guardian Monitor Wi-Fi For Real-Time Ph, Temperature, And Conductivity (TDS) Measurements In Water With Calibration, 3 in 1 Digital Nutrient

Bluelab PENSTP Ph And Conductivity Starter Pack - Precision Nutrient Solution Management Kit With Temperature Measurement, Waterproof Pens, And Probe

Bluelab Combo Meter For Ph, Temperature & Conductivity In Water - Easy Calibration, Digital EC/TDS/PPM Tester For Hydroponics & Indoor Plants (METCOM)