... DPM1003: Carbon dioxide (CO2), CO2 average level (in setting time range: 1~24hous), Temperature, Humidity, Clock and Time. DPM1004: Carbon ... ABC self-calibration technology guarantees reliable CO2 measurement u CO2 range: 0~2000ppm/0~5000ppm optional u Rapid response, ... reliability of such detection by a professional instrument for a single gas is very limited. This multifunction IAQ monitor uses a ...