The PHEC-B2 is a complete digital nutrient controller, featuring industrial-grade pH, EC and build-in temperature sensor. The controller precisely monitor and control the pH & EC in the reservoir, with nutrient adjustment automatically by four dosing pumps. Easy operation, user friendly setting and PH, EC sensor calibration. High/Low alarm keeps the reservoir in a safe range. Key Features Dead band Alarm Setting Pre-mix Technical Sheet EC Range: 0.1~5 mS/cm pH Range: 0.1~14