The 7575 indoor air quality detector is a handheld multifunctional detector with a Chinese menu driven user interface. It is easy and convenient to operate, providing fast and accurate information and evaluation of indoor air quality. The application products for venue testing of the 2008 Beijing Olympic Games have obtained CPA certification issued by the General Administration of Quality Supervision, Inspection and Quarantine of China; The prompts and step-by-step index on the screen of the 7575 indoor air quality detector guide users to operate, set up, and calibrate on site. The 7575 indoor air quality detector has a keyboard lock function, which can effectively prevent operational errors and has a plug-in multifunctional probe. Replacing the head can detect parameters such as CO (carbon monoxide), CO2 (carbon dioxide), temperature, relative humidity, wind speed, air volume, pressure, VOC, etc.