The ACR Systems IAQ-101 CO2 Monitor and Temperature/Relative Humidity/CO2 Data Logger with 32 KB Memory, TrendReader Software, and Serial Interface Cable is an IAQ Logger combined with the Telaire 7001 Handheld CO2 Monitor. It records the three leading indicators of indoor air quality: (1) temperature, (2) relative humidity (RH), and (3) carbon dioxide. This IAQ solution is ideal for those applications requiring long-term, close monitoring and recording. Quickly and easily verify the temperature and CO2 on the Telaire's large, easy-to-read display.