I need to measure the amount of carbon-dioxide in parts per million (ppm) within a closed environment. Currently, I am using a MQ-135 gas sensor which has some sort of concentration on Carbon-dioxide. Unfortunately, that sensor does not provide accurate values.
What gas sensor can I get to obtain precise data?
The cost should not be more than USD 30. The MQ-135 has a very slight concentration on CO². The value it returns has a high fluctuation rate. Within the difference of seconds the value changes from 450 ppm to 700 ppm. I want a digital sensor that should give accurate data like Carbon Dioxide Meter PCE-WMM 50.