The Ion Selective Electrode Sensor is a highly specialized device for measuring specific ions in solutions. Each sensor is designed to be selective to a particular ion, such as hydrogen (for pH measurement), sodium, potassium, or calcium. It works on the principle of electrochemical potential difference. When the electrode is immersed in a solution containing the target ion, an electrochemical reaction occurs, generating a potential difference that is proportional to the ion's concentration. This makes it crucial in various fields. In environmental monitoring, it can measure heavy metal ions in soil and water samples. In medical diagnostics, it helps analyze electrolyte levels in blood. The ion selective sensors offer high selectivity, minimizing interference from other ions. It has a wide dynamic range, allowing for accurate measurements in both low - and high - concentration samples.