This is a tutorial video showing you how to perform conductivity calibration with ZenTest App. Once conductivity is calibrated, TDS, salinity and resistivity will be automatically calibrated as well, since they all originate from conductivity.
In other words, if you need to calibrate TDS, salinity, or resistivity, just calibrate conductivity.
The tester has a hybrid design, which allows measurement and calibration without a smartphone connected.
