CO2

Store a large supply of carbon dioxide in a safe, portable container with our 20-pound all aluminum CO2 tank. Sold empty (you must fill with your own supply), the tanks stand 23.2" high and the slim design won't take up much space in your indoor grow...

This is a replacement CO2 sensor for the Autopilot APC8200 Remote CO2 sensor probe w/photocell & 15' data cable lets you take readings from proper grow room locations 2-Channel Low Drift NDIR Sensor precisely reads CO2 ppm levels