Features: Perfect air monitor for PM2.5 PM10 Detector Meter HCHO TVOC, keep you and your family safe. Highly accurate indoor and outdoor air quality monitoring system with professional grade detection technology. Large LCD display, convenient for your reading anytime. Suitable for using in the car, living room, house with new furniture and decoration, kitchen, bedroom, office, classroom, outdoor environment, etc. High-performance intelligent electrochemical independent sensor, so that the data can be seen as real, slight visual, enough reassurance. No need to stare at the machine value all the time, once the value exceeds the limit, it will immediately sound an alarm.