The ProFlora CO2 Control from JBL provides an easy to use touch screen pH control unit with temperature sensor. When used in conjunction with the JBL ProFlora CO2 pH Sensor Set (available separately) the ProFlora CO2 Control automates the correct regulation of CO2 supply in an aquarium replacing the likes of a timer for the night switch-off Simply enter the KH of your aquarium water once and the ProFlora CO2 Control calculates the matching pH value, which is adjusted by adding additional CO2. The controller then regulates the solenoid valve, adding as much CO2 as necessary to maintain the pH value calculated or desired. The pH measurement of the water is performed via a pH electrode, contained in the JBL ProFlora CO2 pH Sensor Set (available separately). This ensures that you do not receive an old electrode in the set, but always a factory-fresh one. The JBL ProFlora CO2 Control includes the following features: Inc. temperature sensor, modern graphic display with touchpad, sensor check during each calibration, error diagnosis during failed calibration, permanent display: pH actual/set value, sensor voltage, temperature, calibration reminder in days/hours, valve status, precision of measurement, set point adjustment: freely selectable or automatic calculation by means of auto pH, automatic temperature compensation during measuring and calibration, hysteresis freely selectable (upper and lower deviation from switching point), alarm function pH (alarm range), alarm function temperature (range and set point alarm), selectable valve status, language selection: D/BG/F/NL/I/DK/E/P, reset function, universal power unit suitable for all common mains voltages worldwide.