Apera Instruments AI422 EC400S Portable EC (Conductivity)/TDS/Salinity/Resistivity) Meter Kit, GLP Data Management (500 Groups of Data Storage), USB Data Output, 1.3" Height, 3.4" Wide, 7" Length
Apera Instruments Salt20 Value Salinity Meter, Pocket Tester, Waterproof, ±1% Accuracy, ±0.5˚C Temperature Sensor, Complete Kit
50ml Ph Calibration Buffer Solution Kit with 4.0 7.0 10.0 & Orp222mv Kcl Storage Solution for Ph Meter, Accurate Calibration for Lab Hydroponics Aquarium(orp222mv)
50ml Ph Calibration Buffer Solution Kit with 4.0 7.0 10.0 & Orp222mv Kcl Storage Solution for Ph Meter, Accurate Calibration for Lab Hydroponics Aquarium(4.0)
pH calibration solution 100 ml pH4 / pH7 / pH10 buffer solution calibration solution buffer solution (pH 4+ 7 +10)
PH Calibration Solution Kit with 4.0 7.0 10.0 Buffer Solutions and KCL Probe Protection Liquid for ORP Meter Calibration Fluid and Hydroponics PH Testing(7.0)
