Another project that demonstrate how to build a low cost lake/pond water level logger sensor that can be deployed without an RF communication. however this project works as independent/standalone can be deployed on a remote area intended for science and
Wiring the ORP Oxidation-reduction Potential Sensor with pH/ORP Probe on ESP / Arduino Microcontroller
This is ORP OXIDATION-REDUCTION POTENTIAL probe sensor, Oxidation is the loss of pf electrons and reductions and gain electrons. The probe are represented in millivolts can be positive or negative, the same like pH that measures hydrogen ION activity in