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With a built-in display and data logger, the ACR-205 provides the user with a reliable and accurate method of evaluating indoor air quality by measuring and recording temperature, relativ humidity,carbon dioxide, and one or two other gases at the same time. These other gases can include: carbon monoxide (CO), nitrogen dioxide (NO2), oxygen (O2), ammonia (NH3), chlorine (CI2), chlorine diocide (CIO2), fluorine (F2), hydrogen (H), hydrogen chloride (HCI), hydrogen cyanide (HCN), hydrogen sulphine H2S), nitric oxide (NO), ozone O3), or sulphur dioxide (SO2).