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How do I measure co2 in the air? Is it possible without parting with $500+??

Here are some before and After pics. please help.

I just started flowering and noticed a couple of plants developed some powdery mildew. Then as instructed, I mixed some vinegar, baking soda, cooking oil and water and sprayed the leaves of ALL the plants with that solution. Now all my plants are in bad shape. They've gotten yellow...

Ok this is my first grow and I'd like the advice of those in the know regarding how to do this more efficiently if possible. First here's what I have: Equipment ============== GrowLab 60 2' X 2'X 5'3" Sun System 2 HPS 400 Watt 4" Elicient Inline Fan 152 CFM 4" Phresh carbon Filter 2 6"...