“…As shown in Fig. 24, most of the reviewed studies utilized multiple sensors, with pH, temperature, and turbidity sensors being the most commonly used in combination with other types of sensors [32], [136], [137], [138]. For instance, Campagnaro et al [128] employed six different sensors, including temperature, pressure, pH, turbidity, dissolved oxygen, and EC sensors, while Kumar et al [135] utilized five different types of sensors, including temperature, pH, conductivity, dissolved oxygen, and Eh potential sensors, to measure different water quality parameters.…”