For this project , that is build up a Arduino base PH meter for monitor PH , Water Temperature and Room Temperature. Hardware that you should need is :

Arduino UNO R3
LCD Keypad Shield
PH Meter Board
3D Printed Case

Feature :

Show real time PH reading , Room and Water Temperature
Use keypad for enter "Calibration Mode" for read the PH reading for PH calibration
Serial Port communication via Arduino UNO USB port , send command to UNO for get back the PH and Temperature readings.
use mysensor to send data info
use eeprom to store data of calibration
use peristatic pump to add ph up/down

first version : https://github.com/kevinlohk/ArduinoPhMeter