EC controller, range: 0.0 to 10.0 mS/cm, with ±2% accuracy. Set point range 0.8 to 2.8 mS/cm, and led visual alarm active when reading is higher or lower than set point. Power plug socket for nutrient dosing. Supplied with 12 VDC power adapter, MA812/2 probe, 20 mL 5.00 mS/cm sachet buffer solution and screwdriver for calibration.