Pre-Owned Titan Controls Atlas 2 – Preset CO2 Monitor/ControllerThe Titan Controls Atlas 2 makes monitoring and controlling CO2 levels simple and hassle free. It's easy to set up and operate just mount the controller to the wall at plant canopy level, plug it into a power source, and then connect it to a CO2 source. The controller comes factory calibrated and set at an optimal 1500 parts per million, making it the easiest controller to use on the market. Offers CO2 enrichment during daylight hours with the built