DescriptionMultifunctional and scientific: This indoor air quality monitor accurately assesses multiple air quality measures, including formaldehyde (HCHO) concentrations, natural and synthetic volatile organic compounds (TVOCs) that cause most odors, and fine particles measuring 2.5 microns in size (PM2.5) that travel deep into the respiratory tract, reaching the air sacs of the lungs and can make asthma worse.Portable tests: check indoor air quality anywhere or leave the device on for continuous monitoring for up to 2 days. This easy-to-carry air quality tester can help monitor air quality at home, in the car, and in hotel rooms. The 2200 mAh battery provides portable power when DC 5V micro USB charging is not available. Information is displayed on a clear 2.8-inch color LCD screen.Advanced Fan and Sensors: This air quality monitor has a built-in fan to rapidly exhaust ambient air to enable real-time measurements. It incorporates a laser sensor to measure dust particle levels and has a second electrochemical semiconductor sensor to measure levels of formaldehyde and natural/synthetic organic compounds.Healthy home Does your family suffer from sick building syndrome This air quality tester detects organic compounds such as formaldehyde which has suspected links to nasal cancer and lung cancer emitted by many household materials. By measuring particulate pollution, an air pollution monitor can also help you know when your asthma may worsen and when to change your homes air filter.