pH transmitters provide electrical outputs that are proportional to potential of hydrogen (pH) inputs. The pH scale is used to express the acidity or alkalinity of a solution by measuring the concentration of hydrogen ions in the solution. An acidic solution has a higher concentration of hydrogen ions than an alkaline solution. pH transmitters include a pH sensor, which uses electrodes or wires to test the solution’s pH measurement, and a controller which processes the raw signal from the pH sensor and delivers it to the transmitter. In this way, a pH transmitter is able to convert the pH of a solution into an electrical signal. Some pH transmitters are designed to be completely submersible and can simultaneously transmit both pH and temperature readings.