Specifications: EC Range: 0.0-9999us/0.0-20.0Ms TDS Range: 0.0-9999ppm/0.0-10.0ppt Resolution:uS&ppm:0.1(0.0-99.9);1(100-9999); ms&ppt(0.1) Accuracy:±2% Temperature Compensation: ATC(1-65°C) Calibration: digital by push button Alarm: ON/OFF upper/lower limit Display: LCD with backlight Analog output: 4-20mA Sensor Probe: 1/2″ NPT bushing, dual Probe Length: 3m Working Condition: temp. -5°C~50°C, humidity≤85% Power: AC220V±10% 50/60Hz Size: 96*48*100mm Weight: 258g