Our understanding of calibration is unique. While other companies just compare one single channel of the instrument, we check all 31 channels by decreasing concentrations in order to provide in every size channel best possible fit (+/- 3%) to our approved mother instrument. In this way we secure, that all instruments, calibrated by GRIMM are measuring the same.
After calibration with dolomite and room air, the enviro instruments also have to fit under ambient air conditions outdoor in our measurement container. This is the way to secure not only calibration under artificial conditions, but also under real outdoor conditions with environmental aerosols.
Wherever you have a GRIMM calibrated instrument, you will measure with the same accuracy!