The DIN DIGITAL controllers are a series of single-indicator systems, mounted on a rail (6 modules) and suitable for many applications. They can set and monitor: pH, ORP, chlorine (depending on the sensor: total chlorine, free chlorine, chlorine dioxide, hydrogen peroxide, ozone, bromine or paraacetic acid), conductivity, ozone, chlorine dioxide and temperature. Sensors are not included. The DIN DIGITAL models have: 2 setpoints (on/off, proportional), flow alarm, backup flow sensor input, 0-20 mA or 4-20 mA output, proportional to the reading and programmable within the reading range.