Temtop air quality monitor is perfect for home, office, car, indoor and outdoor environmental testing. Air quality monitors can detect all the different pollutants in the atmosphere, but not all models can detect the same materials. Particulate matter often hovers in the air, causing allergic reactions and other breathing problems. PM refers to particles between 2.5 and 10 microns in diameter, called PM10. Objects smaller than 2.5 microns are called PM2.5. Not all air filters remove PM2.5 particles. Even if you use a filter system, you may have something at home. An ideal tool to monitor the air quality, a safeguard for family health. High-precision electrochemical sensor can accurately detect air quality. Built in large capacity lithium battery which can be used more than 12 hours in air quality metering.