Milwaukee Instruments SMS 122 Smart Monitoring System Controller is designed for use with aquariums. With Milwaukee's Smart Controllers you can monitor and control pH levels directly in your aquarium. The meters have a user selectable pH set point and a visual LED alarm that is active when the reading is higher (for pH) than the set point. The controller will automate the use of a pressurized CO2 system on a Freshwater Planted Aquarium or a Calcium Reactor Setup for a Saltwater Reef Tank. Milwaukee's controllers work with a 12 VDC adapter and the unit can be mounted near your aquarium for easy access. With the Milwaukee Smart Controller your aquarium will have the individual and automatic attention that it needs.