Building the Simplest Possible pH Meter • 66pacific.com
Making high-resistance voltmeter is not easy, as such devices are much more sensitive to temperature changes and electromagnetic noise, as well as to electrostatic charges. However, with electronic elements available today it is not very difficult to create an ...
How to Use a pH Meter Correctly in 4 Simple Steps
sensor - Building a pH meter circuit - is it feasible? - Electrical Engineering Stack Exchange