He picked up pH, temperature, carbon dioxide, alcohol, and relative humidity sensors from familiar vendors like Seeed, Parallax, and SparkFun. His original idea was to develop a floating probe ...

Best dual-probe Three sensors are better than one. You likely won't use the pH probe as often as the light and moisture sensors, but it's convenient to have the option at your fingertips.

The pH meter consists of a reference electrode and a pH electrode, and the potential difference between these two electrodes is measured. The pH of the solution can be directly calculated from the ...

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