Promotes plant growth. Leads to healthy fish: computer for high-precision calculation & control of the optimal pH value Enter desired pH value in menu and connect it to solenoid valve (not included). This automatically regulates pH value Digital measurement/control technology: graphic display, direct user interface, separate sensors f. pH value/temperature Compares the wished for and actual pH value and adjusts the CO2 supply with solenoid valve (not included) Contains: CO2/pH control unit, temperature sensor + suction cup, wall bracket, cable to solenoid valve, cuvette holder