The pH electrode must be purchased separately (not included in the set). It controls the CO2 addition for optimal plant growth in the aquarium and the ideal pH level for aquarium fish. The temperature sensor, transformer, and pH electrode (not included) must be connected and linked to the solenoid valve. The desired pH level can be entered manually or the automatic program can be used. The touch display allows for easy operation through the menu. For automatic regulation of CO2 addition, the carbonate hardness (KH) must be measured and entered. The program calculates the ideal pH level based on the KH and the existing pH level, adding CO2 until the desired pH is reached. It also displays the water temperature.

Included: CO2 control unit with touch display, wall mount, power supply, temperature sensor with suction holder, connection cable to the solenoid valve, and cuvette holder for calibration liquids.