Online pH Indicator “The pH 600 – 1 series of pH Controller and Transmitter provides a reliable Method of Monitoring, Controlling & Transmitting 4 – 20mA / RS 485 MODBUS RTU communication for Interfacing to PLC & Data logger. This product is suitable to measure pH in water treatment, Electrolytic water cleaning, Chemical Industries, Food Process, Waste Water treatment, Textile Industries & Neutralization process, etc.,. This pH Controller & Transmitter can Measured using Industrial Combined pH Sensors, Temperature can be measured using temperature sensor. This pH Controller & Transmitter has many User Friendly and Safety Features”