.. pretty much all instrumentation requires semi regular calibration, it varies by how often and how serious you are about exact results.
Many CO2 meters are sensitive to dirt | dust | crud build up ( see article ) and should be reset semi regularly as per the manual (or by the linked site guidelines if you've gotten a cheap one with no documentation).
.. pretty much all instrumentation requires semi regular calibration, it varies by how often and how serious you are about exact results.
Many CO2 meters are sensitive to dirt | dust | crud build up ( see article ) and should be reset semi regularly as per the manual (or by the linked site guidelines if you've gotten a cheap one with no documentation).