The Milwaukee C66 waterproof conductivity tester includes the IP67 waterproof casing, and is specifically designed for the hydroponics and agricultural markets, with automatic temperature compensation and 1 point manual calibration. The C66 has a range of 0.00 to 10.00 mS/cm, has a replaceable electrode, and is supplied with calibration solution sachets (M10031) and a screwdriver for calibration. The modular design allows for easy electrode and battery replacement.