c02 level

[johnk]

Ron: Thanx for all the helpfull info. I called the store that sold me the cd-3 genorator and they were very little help.They suggest 30 mins. on 30 off. With in 3 days the plants were curling/dring out.I assume to much c02.Now I'm trying 30 mins. on 4 hrs. off hope that will fix the problem. Is there any way to measure c02 level without a CDM-1 sensor{determines atmospheric c02 value}