Best Online pH meter from Vasthi Instruments to measure pH, EC, and DO in water with flawless accuracy. Can also be used to measure TN/TP levels online. Online pH Meter This industrial-grade online pH meter from Vasthi Instruments is highly accurate and designed to monitor continuous pH measurement in many areas of water treatment plants, power plants, medicine manufacturing units, and other laboratory applications. designed with the latest technology to accurately measure dissolved oxygen (DO), alkalinity/acidity (pH), and electrical conductivity (EC). The pH sensor can also be used to detect total nitrogen (TN) and total phosphorous (TP). FEATURES : Modular Board design for easy assembly Universal Password option Isolated Transmission Output Can be configured to measure Total Nitrogen and Total phosphorous (TN/TP) levels. RS 485 output for communication Adjustable Alarm settings Configurable manual and automatic temperature compensation