The pH Controller enables automatic CO2 regulation in your aquarium, dosing CO2 only when necessary. It continuously monitors the water's pH level, activating the connected solenoid regulator to release CO2 when the pH rises. This addition of CO2 decreases the pH until it reaches the desired target, at which point the controller deactivates the solenoid. This system prevents CO2 overdose, which can occur due to prolonged timer settings or 'end of tank dump' scenarios. Consequently, it optimizes CO2 usage, leading to fewer refills and cost savings over time. The kit includes electrodes, calibration solutions (pH 4 / pH 7), and a control panel with a protective cover against dust, moisture, and tampering. The versatile holder fits any glass thickness, and an adjustable hanging rack is provided for various glass widths. Designed for full voltage compatibility (100v-240v / 50Hz-60Hz), it features an LED digital screen for clear readings.