The Milwaukee EC59 PRO Conductivity (EC) & Total Dissolved Solids (TDS) Tester is designed for aquaculture, food, wine, laboratory, water treament and many other applications. It is the ideal meter to help make sure that your EC/TDS/Temperature needs are being met and are reliable results for your analysis.Milwaukee waterproof 3in1 Tester EC59+ measures EC/TDS/Temperature with automatic temperature compensation (ATC)+ ideal range for all different applications (0 to 3999 uS/cm) | 0 to 2000 ppm | 0.0 to 60C+ units in uS/cm or ppm easily convertable to other ranges+ factory calibrated with the ability to recalibrate if needed+ replaceable electrode Mi59P+ fully waterproof to IP65+ approximately 100 hours of use (4 x 1.5V batteries included)technical data Milwaukee waterproof 3in1 Tester EC59EC Range: 0 - 3999 uS/cmTDS Range: 0 - 2000 ppmTemperature Range: 0.0 to 60.0CEC Resolution: 1 uS/cmTDS Resolution: 1 ppmTemperature Resolution: 0.1CEC Accuracy: 2% Full ScaleTDS Accuracy: 2% Full