The Q-Certification verifies the calibration / photometric accuracy of the Chematest under test by comparison with a reference instrument. The comparison is performed for DPD-based ozone determination (DIN 38408-3) at four different ozone concentrations between 0.08 ppm and 3.0 ppm which are simulated by liquid absorbance standards.
The calibration of the reference instrument is periodically verified by an external ISO 17025 accredited lab.