Apex EL Controller System - Neptune SystemsThe ApexEL has built in WiFi, Temperature, pH, monitoring and much more! Set reminders, log testing and dosing information, and access your tank from anywhere with Apex Fusion! Just as powerful as the flagship Neptune Systems Apex Controller but at a much more affordable price. The ApexEL is a great entry into gaining full control over your tank, giving you everything you need to get up and running. The ApexEL forgoes a few of the included features