I dug around in my parts bx and found my old co2 tester. Syringe with hose attached and you buy those one use only tester tubes. gets expensive. I will experiment in my aquarium that i converted into a mini clon e islation chmbr yrs ago. I bought a .5 gal jug that will fit in it with a old co2 drip ring attached. It has a fan and 2 cfl's and can do dirt or hydro ebbnflow and easily made air tight with duct tape. The problem is the monitoring. That co2 monitor in the link you posted is perfect but its expensive...$150.I'm going to experiment first figure out the ratios for yeast,sugar,water....it takes to make 1300 ,then how long it'll last in my tank. I can do that cheaply with my old school tester for now but with test subjects i'll need something better. Had to chop a plnt in the first week of flwr today it was a male. Immediately put another plnt from veg chmbr in its place and i'm hoping its female. Thats the problem with bag seed.