Milwaukee Instruments, EC59, Waterproof 3-in-1 Conductivity / TDS & Temperature Tester with Replaceable ProbeEC59 Incldues Only:Conductivity / TDS Temperature TesterBattery 4 x 1.5V; IEC LR44, A76The 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/Temp. needs are being met and are reliable results for your analysis. Keep EC/TDS/TEMP. in your target range to help your achieve best results.Features:Measures EC/TDS/Temp. with automatic temperature compensation (ATC).Ideal range for all different applications (0 to 3999 uS/cm) | 0 to 2000 ppm | 0.0 to 60°C (32.0 to 140.0°F). 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)