I can only offer a user manual to the device. The next to last page of the manual lists contact information by country. You might see if you can get the answer from a listed source.
https://www.grainger.com/ec/pdf/GasBadge-Pro-Instruction-Manual.pdf
A prior Fixya answer offers the following:
A reading of 221 ppm carbon monoxide gas is a dangerous level that should be taken seriously. You could try a new battery and reset the detector.
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