The EHEIM pHcontrol+e is a smart aquarium pH controller that connects via WiFi to your smartphone, tablet or PC to monitor water pH and automatically regulate CO₂ injection for stable pH levels. It supports a control range from about pH 6 to pH 9, works in both freshwater and marine setups, and features guided sensor calibration, KH-based calculations, day/night modes and compatibility with other EHEIM DIGITAL devices.