Controllers, PPM Monitors
Use CO2 in your garden to increase plant yield by up to 20%. Plants benefit most from CO2 when the PPM (parts per million) of CO2 in the air is between 1000 and 1500. Ambient is usually about 300 PPM. Use our CO2 Calculator for Grow Rooms to find out where to set the flow gauge on your regulator, and how often to turn your regulator on. New to CO2 enrichment? Read our CO2 Buyers Guide and 'How To.' CO2 Controllers help the dosage of CO2 into your grow room. They often have PPM Monitors built in to help the controller keep the PPM of CO2 in your grow room within a beneficial range.

  1. $241.39

    Select CO2 PPM levels at 1000 PPM, 1250 PPM or 1500 PPM. Integrated photocell. Built-in calibration feature. Single button control. Enclosure resists dust, rust, and moisture. 5 Amps maximum/120 Volts/60 Hz. Learn More
  2. $422.00

    The Atlas 3 is easy to set up and simple to use. It controls (500 PPM to 2000 PPM) and monitors (500 PPM to 5000 PPM) CO2 and offers CO2 enrichment or CO2 exhaust features. Plastic enclosure resists dust and moisture. Another innovative product brought to you by Titan Controls! Learn More
  3. $280.66

    Preset CO2 control at 1500 PPM. Built-in self calibration feature. Easiest to use CO2 Controller on the market. Simply plug in your CO2 generator or regulator and you are ready to go. Built-in photocell allows CO2 enrichment only during daylight hours. Durable powder-coated steel housing. 15 Amps maximum/120 Volts/60 Hz. Patent No. D657,748. Learn More
  4. $369.67

    Out of stock

    This item is no longer available, please see Related Products below for replacement products Learn More

CO2 levels in the air are measured in PPM (parts per million) and ambient is usually about 300 PPM while plants benefit the most when the CO2 in the air is between 1000 and 1500.

CO2 monitors help to diagnose the PPM of CO2 in the air and CO2 controllers are capable of maintaining the optimal level of CO2 in your grow area by sensing the PPM of the ambient air then turning your CO2 generator/regulator on and off as needed. Many monitors come with some form of logging and can even monitor relative humidity and temperature along with CO2.