pH meter that works with Arduino to measure the pH of liquids

hi dear friends,

 i am currently working out a ph-measurement-set - that is based on Arduino


well there are lots of tutorials, explanations out there:

i found a neat one: See:

pH meter Arduino, pH Meter Calibration, DIYMORE pH Sensor, pH Sensor Arduino Code, pH of liquids
https://www.youtube.com/watch?v=zUEl3Y3yKL4

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