Arduino pH sensor

Introduction

3 major commercially available or mass-produced solutions:

1. Atlas Scientific and Gravity analog pH Kit with board, sensor and buffer solutions. Hiqh quality, not open source.
2. DFRobot Gravity: Analog pH Sensor Kit
3. Other (Chinese) manufacturers.
4. Seed Studio

References

https://www.e-tinkers.com/2019/11/measure-ph-with-a-low-cost-arduino-ph-sensor-board/