I am a professor at a research university with a research interest in indoor air quality (IAQ). The CO2 meter is a must for IAQ studies, as CO2 measurements can be used to: indicate CO2 pollution level by comparing the US EPA guideline value; calculate air exchange rates to indicate the ventilation condition; and calculate fresh air supply to ensure occupants’ comforts.
I previously used a Hobo CO2 meter coupled with a Hobo data logger, but this combination requires complicated connections and is costly. A year ago, I searched CO2 meters on the market when I started a new project. In most IAQ field studies, an ideal CO2 meter should fulfill the following requirements:
After a thorough search, I found the K-33 ELG CO2 data logger on www.CO2meter.com had all the features I was looking for. The price was especially attractive at $350 and could be even lower if you buy more. Some extra upsides:
The only shortcoming I found is the USB to Serial Custom Cable. The end connecting the meter could be easy to break, and must be handled with care. I found a small flat head screw driver helped.
This meter has many applications in my IAQ studies. As an IAQ professional, I highly recommend this product.