http://www.google.com/search?hl=en&i...=Co2+detectors

There is the google link, Op's. Take your pic bro, and I anxiously await a LOG showing this new CO2 enhanced grow.

By the way, BGHydro has a controller/sensor thing that once it reaches 1500 ppm or whatever you choose, it shuts off the generator or tank until it drops to whatever value you set for it to turn back on. Even can get em with photo-eye sensor so it wont kick on during dark period.

From all the reading I have done it seems as if you want to bring up the level in a sealed room, leave it alone/maintain for 4 hours, then have your intake and exhaust fans kick on a do a complete exchange of air and then jack your CO2 back up again.

I also read in one of Zandors posts that your plants suck a buncha water when you gas em. So be prepared for that as well.

If I can offer any other help, just ask. Since I am retired now and my grass is dormant, garden is about done, and ole lady finally got a job, I got nothing but time to research if needed.......LMAO

Best of luck,
b0nger