♦A key to on-line calibration, automatic temperature compensation. ♦Calibration electrode quality alarm, drop the electricity protection (can make the calibration results and preset data is not lost due to power off or power failure), over-current protection, overvoltage protection. ♦High measuring accuracy, fast response, long life and other characteristics. ♦Small size, light weight, easy to install and maintain. ♦Standard industrial signal output (0, 0 to 10 v to 5 v, 4-20 ma, ModbusRTU485) can satisfy the connection of real-time monitoring equipment.