The PPM-3 from C.A.P. is the most affordable and simple CO2 controller available. Its proven technology is very accurate at measuring levels of Carbon Dioxide in your growing area from 0 to 5000 ppm Parts-Per-Million. Using the PPM-3 is quite simple. Just plug your CO2 device CO2 valve or generator into the “piggyback” cord and it will automatically maintain the CO2 level that you specify. The PPM-3 works with any make of CO2 valve or CO2 generator 120v.