IPS Controllers IPS-M920 Automated Dual ORP & pH Controller with Online Monitoring for Muriatic Acid or CO2; 110/230 VAC allows you to check in on real time chemical control activity for all your pools, spas and water features, using your smart phone or tablet. Web-based programming, monitoring, multiple email and testing options for alert notification are built into the M920, with optional wireless Internet access. A lockout feature is included on this model, keeping unauthorized users from making function changes. This top-of-the line automated pH, dual ORP controller is compatible with all sanitizing methods including liquid, tablets, granular and salt chlorine generators