![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 ... 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 ...](http://www.ph-meter.info/img/phcircuit.png)
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 ...
![operational amplifier - Criticism of my differential pH probe design - Electrical Engineering Stack Exchange operational amplifier - Criticism of my differential pH probe design - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/FNqxa.jpg)