HKM-569555 High Sensitivity PM2.5 Air Quality Monitor - Handheld Dust Particle Counter with Temperature and Humidity MeasurementIntroducing the HKM 569555 High Sensitivity PM2. 5 Air Quality Monitor, a portable and user friendly handheld dust particle counter designed to keep you informed about the quality of the air you breathe. This innovative device stands out for its ability to accurately measure PM2. 5 and PM10 levels, as well as counting dust particles, while also providing temperature and humidity readings. Whether you are at home, in the office, or on the go, the HKM