The hand-held air quality detector can accurately detect indoor air quality. By adopting high-precision electrochemical formaldehyde sensor and American "TEMTOP" laser particle sensor and carbon dioxide sensor based on NDIR detection theory, it can transform the concentration of ...The hand-held air quality detector can accurately detect indoor air quality. By adopting high-precision electrochemical formaldehyde sensor and American "TEMTOP" laser particle sensor and carbon dioxide sensor based on NDIR detection theory, it can transform the concentration of air pollutants to visualized data directly providing air quality warning to protect the health of your family effectively.