Autopilot Digital CO2 Controller w/ Integrated Sensor nutrients-and-supplements What is the difference between

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Autopilot Digital CO2 Controller w/ Integrated Sensor nutrients-and-supplements What is the difference betweenDescription Product Details: Autopilot APC8400 Digital CO2 Controller with Integrated Sensor Autopilot APC8400 Digital CO2 Controller with Integrated Sensor: The new Autopilot APC8400 CO2 Monitor and Controller with Integrated Sensor offers a simple and affordable way to control, monitor, and record CO2 levels. Operation modes are CO2 enrichment or CO2 exhaust. The new CO2 Exhaust mode will trigger an exhaust fan to reduce CO2 levels. This is an ideal