Features: Intelligent online conductivity and TDS monitorings and control instrument. With backlights function for easy and clear viewings of measurement data. Equipped with upper and lower limit alarm control function, alarm. 0-9999µS Measurement Rangings, 0.1µS/ppm Resolution , +/-1.5% Accuracy The product is easy installation and operate, and is widely used for online monitorings and control of various water treatments device. Specifications: Material:ABS TDS rangings: 0.0-9999ppm/0.0-10.0ppt Resolution: uS&ppm: 0.1 (0.0-99.9); 1(100-9999); Accuracy: ±1.5% Calibration: Intelligent calibration with button Relay: can control 1≤ 2A, 220V Alarm: ON/OFFs highly limit and low limit alarms Display screen: Backlits 2.3'' Screen Type:PSC50,PSC54 Package Includes: 1Piece Electrical Conductivity Meter note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.