With my pH probe calibrated and working I took it all out to the pool and hooked it up.

I have my Arduino with pH probe adapter board and analog temperature sensor to measure air temperature along with the LCD display to show the measured air temperature and pH of the pool water.

I have the pH probe in a modified pool chemical floater connected to the Arduino with a cable.

The measured result is close to 7.3 which is the pool water pH so the proof of concept works!