C.A.P. PPM Monitor/Controller, PPM-3

C.A.P. PPM-3 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 into your co2 device (co2 valve or generator) into the "piggy back" cord & it will automatically maintain the co2 level that you specify. The PPM-3 works with any make of co2 valve or generator that is 1320 volt.