The Aqua Medic pH Computer-Set utilises a modern microprocessor, which provides high precision measurement and control. The Aqua Medic pH Computer-Set is used to control precise values of pH in the aquarium or the Calciumreactor. The computer can switch up to 500 watts using the supplied external electrical socket. When the calibration key has been selected the unit will automatically calibrate itself to the electrode. A plastic shafted pH electrode with BNC fitting and the correct calibration fluids (pH 4/7/9) are included.The pH value is an electric value that is a parameter for the acidity of water. In the aquarium, the pH value together with the carbonate buffer system is of special interest.In a fresh water aquarium, the pH value is responsible for the percentage of free CO2 that is used by green plants for photosynthesis. Fertilization with CO2 has been well-established for fresh water aquaria as base for a good plant growth. With the Aqua Medic pH Computer, the pH value can be a