C.A.P. CO2 PPM Monitor & Controller - PPM-3

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). The PPM-3 works with any make of CO2 valve or generator that is 120 volt.