Online ORP Indicator  “The ORT 601 – 1 series of ORP 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 ORP in water treatment, Electrolytic water cleaning, Chemical Industries, Food Process, Waste Water treatment, Textile Industries & Neutralization process, etc.,. This ORP Controller & Transmitter can Measured using Industrial Platinum ORP Sensor. This ORP Controller & Transmitter has many User Friendly and Safety Features”