Apera Instruments AI522 EC800 Laboratory Benchtop Conductivity/TDS/Salinity/Resistivity/Temp. Meter Kit, 1% F.S Accuracy, GLP Data Management (USB output), Plastic/Glass

Apera Instruments GroStar Series GS1-P pH/ORP Pen Tester Kit with Replaceable Double-Junction pH Probe and ORP Probe for Hydroponics Water Quality Testing, Gen II

Apera Instruments GroStar Series GS2-E Replacement Soil Spear pH Probe (AI802G)

Apera Instruments GroStar Series GS4-P pH/EC/500ppm/700ppm/ORP 6-in-1 Combo Pen Tester Kit with Replaceable Double-Junction pH/EC Probe and ORP Probe for Hydroponics Water Quality Testing, Gen II

Apera Instruments LabSen 553 PVC-Body Spear pH/Temp. Electrode for Root-Zone Soil Direct pH Measurement, with Built-in Temperature Sensor

Apera Instruments LabSen 763 Stainless Steel Blade Spear pH Electrode for Meat, Temperature Sensor Built-in

Apera Instruments MP511 Benchtop pH Meter, Accuracy: ±0.01 pH, Range: -2.00-19.99 pH, 500 Sets of Data Storage, RS232 Data Export

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