Error code
Testo co2 ölçer All models code CO2
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Meaning
yes (adjust) or no (do not adjust) yes selected: CO value is adjusted to the nominal value 2 and stored (only possible with a current CO 2 value < 650 ppm)
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Address of this page: https://www.remfixit.com/tr/testoco2olcer/tum-modeller/co2