What I want to do
I wrote a how-to article describing the step by step process needed to accurately measure indoor carbon dioxide levels which is a component of indoor air quality. All supplies can be purchased for about $50 total which will give you ten CO2 tests.
How to measure CO2 blog post: http://lukeskaff.com/measure-carbon-dioxide-co2-levels-test/
Full how-to video: https://www.youtube.com/watch?v=qSiyGLnoKCM
Supplies & Cost
RAE System 10-104-30 carbon dioxide colorimetric detection tubes - $35 plus shipping
100 mL syringe with tube - $10