Advanced multi-sensor detection with precision monitoring of formaldehyde (HCHO) and TVOC levels using electrochemical and semiconductor sensors, with immediate data logging. This portable air monitor delivers lab-grade accuracy for comprehensive indoor air quality assessments through a multi-sensor fusion algorithm, without interfering with other electronics. Compact, plug-and-play design for living rooms, renovated spaces, classrooms, or temporary workstations; no installation required. SEN+-calibration technology, temperature compensation, and LED refresh within 5 seconds for stable ambient air analysis. Use scenarios: - After a home renovation, assess HCHO and TVOC levels to guide ventilation and purification decisions. - In classrooms, monitor indoor air quality to maintain a healthy and comfortable learning environment. - In temporary offices or shared spaces, perform quick QA of air quality during occupancy.