The Milwaukee MC310 conductivity monitor is designed to continuously monitor pH, EC or TDS values directly in your reservoir with a 0.0 to 10.0 mS/cm range and a 0.1 mS/cm resolution. The MC310 is ideal for the hydroponic market and allow you to continuously monitor EC or TDS values directly in your reservoir.|Each unit features a user selectable set-point. An LED visual alarm is activated and flashes when the pH, EC or TDS level rises either above or below the user-selected set-point.|The Milwaukee MC310 monitor runs on a 12V adapter so there's no need to worry about failed batteries.